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 threema: 
no multiple accounts/profiles, only client is open-source, no Post-quantum encryption, only f-droid ver. comes without proprietary libraries, centralized, maximum number of participants group chat is 256, not the best at protecting metadata, no screensharing, no self-destructing messages and paid.
 
 Interesting… thank you. 
 You urgently need to update your prejudices, then you will spread less misinformation.

But when someone is already called "epicshitposter", you can't expect much competence.

"no multiple accounts/profiles"
That's wrong. Anyone can install 2 versions from the Appstore Threema and Threema Work. And then have 2 Threema IDs. For example, to separate private and business communication.
Android User can even install ThreemaLibre for a third ID!

"only client is open-source"
That is correct. But the source code for the server is of no use to anyone, because no one can verify whether it's actually running on their production servers. The same applies to other messengers, such as Signal!

"no post-quantum encryption"
It doesn't even exist! Anything that can be encrypted can also be decrypted again. This has less to do with the messenger than with quantum technology.

By the way:

"Researchers use a Commodore C64 to calculate a quantum computer - and annoy IBM with it

Researchers have beaten a quantum computer with an old Commodore 64. The experiment is a friendly dig at IBM, which has claimed that only quantum computers are capable of performing such calculations."

See (unfortunately only in German = please translate for yourself):
https://t3n.de/news/forscher-c64-berechnung-quantencomputer-ibm-1619710/

"only f-droid ver. comes without proprietary libraries"
This is also outdated. The version from the Google Playstore can also be configured to work without Google.

"centralized"
Right, because with Threema this is a security feature. It always depends on how an operator handles it!

There may be spy servers in federated systems that collect your data, see Signal or Matrix. I wrote more about this above.

You can also host Threema on your own server:
https://threema.ch/en/onprem

"maximum number of participants group chat is 256"
That is correct. More users makes no sense. If everyone writes something, no one can keep up anyway!

"not the best at protecting metadata"
What makes you think that? Threema is the only messenger that doesn't store any metadata.

Threema only stores messages until they have been delivered to the recipient.

And most importantly: Threema is the only messenger that does not store any metadata or IP addresses.

If you communicate digitally - and we all do that today - and don't want to leave any traces behind, there's no way around the Threema app. 

"no screensharing"
Threema is programmed for the greatest possible data protection, which of course also means that no one can read your screen (except you). Android users can also activate the screenshot lock.

"destructing messages"
So far, there is no implementation of self-destructing messages that offers real, reliable security and goes beyond gimmickry. 

Even if a message has disappeared from the chat, it remains in the notification log of the cell phone operating system, for example, and can be read by third parties using simple means. 

This lulls you into a false sense of security. As I said, false security is not our thing.

"paid"

There is no such thing as a "free messenger" - there are always some data collectors behind it!

Look where the money comes from = Look who´s behind !!! 

Threema has no dubious financier in the background and is therefore completely independent.

Private users pay a one-time fee to ensure that they are not spied on.

What are the few dollars for Threema compared to being permanently spied on by all the other messengers?

If you want to buy Threema with sats, you can do it from me:
https://primal.net/e/note14r3uwldurcseuuu9wzntgjsacag3wh3yesrezs5y3ukde6zgmk2sw5708f

or note:
note14r3uwldurcseuuu9wzntgjsacag3wh3yesrezs5y3ukde6zgmk2sw5708f 


 
 all I listed was as far as I knew, and we learn by sharing and talking.
1-
Do you really call this mutliple account support ?
see how amethyst/simplexchat does mutiple account support.
2-
as far as I know, yes no one can be 100% sure what is running on the servers, but how is there no use for the source code of the server? seems dumb tbh.
3-
I'm no expert, I really don't know, will try to read what you listed.
4-
How is it outdated, you said that the GP ver. can be 'configured' to work without google, this confirms that the libraries are still shipped with that ver.!
5-
I'm not saying that is always bad, I was just listing things that people may not like about threema. being centralized makes it easly blocked by governments, right?
6-
you(or threema) are not the one to determine what is the best user limit of a group! this is just dumb
it's like how 'discord femboys' argued that the 8mb file limit is great beacuse it makes memes pixelated and that's funnier!
7- https://www.messenger-matrix.de/messenger-matrix-en.html
says that threema partially Avoids / Protects metadata during use, unlike simplexchat or session.
8-
"Threema only stores messages until they have been delivered to the recipient."
what is new here ??
same as what'sapp/simplexchat.
9-
"If you communicate digitally - and we all do that today - and don't want to leave any traces behind, there's no way around the Threema app."
buying the app is a trace!
10-
screensharing is a feature
people might need it,so I listed it,simple.
11-
as for destructing messages,
I asked the simplexchat devs if it provides anything over deleting by hand, still a feature.
12-
"Even if a message has disappeared from the chat, it remains in the notification log of the cell phone operating system, for example, and can be read by third parties using simple means. "
good point, that obv applies for all apps.
13-
as for being paid, I get that you feel i just listed everything 'bad' with threema, but still, being paid is a 'big wall' to get over when trying to get people to switch,"why should I buy threema when what'sapp is free"
14-
"What are the few dollars for Threema compared to being permanently spied on by all the other messengers?"
really? all? you threemaer 
 1 = yes
And its real dataprotection, because if you have multiple accounts in one App, this App knows all your Identitys.

2. 
You can´t verify. Signal presents its user a "clean" servercode - and what Google, Amazon, Microsoft & Cloudflare are doing is invisible!
That a "Bullshit"-Code to gag on their user.... = useless !

4.
No its not! Like any other thing in this world: If it switched off there is no more connection.

5. 
Switzerland will never block Threema, because they use it widely in the swiss administration and the swiss army. They don´t shoot themself in the knee! Threema has never been blocked, will never and is permanent online for 11 1/2 years now.
You can dream something else now.

6. 
A messenger must be useable. If you have a group with 200.000 Users (like in Telegram possible) and everybody write something every minute, you battery will go from 100% ----> 0% within 3 hours!
Large Groups are bullshit!

7. 
Then ask Mike Kuketz, what he means.... when I ask him, he never answered.
WhatsApp stores all your messages permanently, decrypts it and profiles you psychologically for meta and for advertisers.
SimpleX runs accross relays and not every relay runs the original servercode. The same issue as above....

9.
You can buy Threema without any trace.
No Email needed. You can pay anonymous with Appstore Vouchers, Cash Money or with Bitcoin. And from me with Bitcoin Lightning, without any Data from you, going to Threema - guaranteed!

10.
Its safe to make your own Screenshot and then send it with Threema as pictures. Its safer then including a Screeshot-Routine within the App.

11. +12.
Its all stored in the notification-log. And you never know how the smartphone of the receipent is configured. There is no use for chat that is deleted in the messenger, if its stil available in log-textfile!


13. + 14.
Threem stores nothing.

WhatsApp stores ALL you intimates chats, pictures & videos. If they get into the wrong hands, it will turn out very bad for you.

Learn to think twice, my friend! Here are the right informations for you:

Why Threema Instead of WhatsApp?
https://threema.ch/en/why-threema

Messenger Comparison
https://threema.ch/en/messenger-comparison 
 1- 
No, that's not proper support but good point
you can always use another profile\workprofile.
2-
true, but is it 100% useless? I don't think so. maybe.
4-
still my point is true, the app is shipped with proprietary libraries, you seem to just be mad.
"Like any other thing in this world: If it switched off there is no more connection."
iPhones disagree :)
5-
I said "governments", meaning any of them could easily block access to threema.
I remember UAE banning what'sapp calls becuase security reasons! this is just an example. look at iran and china for more!!
6-
just no, a hard limit to all users is just dumb.
it is on you if you join huge groups.
7-
will try ask him :)
edited the original post a bit.
fuck meta anyway!
9-
still not as easy to access as free of charge apps.
appstores need accounts!
10-
have you ever used screen sharing before ?
11+12-
true 
13+14-
you didn't reply :|
I'm not against the app being paid, It is a tool that will be harder to convince people to use.
"threem stores nothing."
doesn't mean "all" other messangers do!
I'm not saying what'sapp is better
I was just saying what a layman may say, that's why I used the "
I'm trying to think twice. thanks, but I'm not your friend! 
 "Free Messenger" spy on Users

Threema does not!

Very simple!