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 Also note that when you publish to mainstream platforms you also can't take things down if someone else doesn't want them to go down.
I can quite easily make a bot that backups everything you post on Twitter and posts it somewhere else.

Once you send something to a receiver, there is never any technical way to take it back. It's an actual impossibility.
And if you *publish* something, everyone is (potentially) a receiver, whether you publish it using Nostr, Twitter or anything else. 
 actually both Twitter and Facebook have ways to limit audience.

nostr doesn't (yet) 
 What ways do they have to limit audience?
My point is that anyone receiving content will be able to retain it forever and republish it.
Of course if only a few people ever receive certain content, and you trust them to never republish it, it won't be republished. 
 yeah, of course it boils down to trust and "loyalty" of receivers not leaking

having public key of users you can do symmetric encryption of content and distribution of only such key for each viewer (be it pgp style or whatsapp groups or any other way to achieve "group encryption")

would be a way to take heat off relays (they cannot censor / cannot see content) and also basically have an hidden profile (only metadata leaked as in time/size/amount of recipients) accessible for example only to subscribers. 

or for example send them the symmetric key when a certain amount of sats thru zaps is sent... sort of like medium style "articles" with "pay per view" on each post, some posts or how you desire  
 Well, Nostr does have private messages.
The issue with private messages is that everyone can still se who is sending a private message to whom, at what time and how long.
The only private thing, which not even relays can see, is the content of the message.

My point was that Nostr isn't very dissimilar respective to your direct control of things that you publish (not just send to others privately): whatever you use, others may use that content in any way, including illegally. It's not really something you can technically prevent. 
 yeah,DMs but instead of 1to1 being 1toN

agree that it doesnt fix everything but would be exactly like onlyfans for example 
 Sure, you can do that with Nostr. 
 same for onlyfans and tiktok to bring two more examples of locked down/behind paywall platforms 
 Is this why videos from OnlyFans are re-uploaded on other platforms? This is something authors (rightfully) complain about, but there is no technical way to make sure it doesn't happen. 
 In a sense, data ownership on traditional platforms like Facebook and Twitter is governed by a terms of service, but on Nostr, it feels somewhat closer to publishing to the public domain. 
It doesn't feel forthcoming to compare Twitter's ability to delete your data upon request to Nostr's. Someone could, theoretically, be backing up your tweets, sure. But large platforms do quite a bit to prevent that, it's against their terms, and anyone using it would or should know that the data was obtained in bad faith. On Nostr that's not the case. Nostr's operating model has no real agreements. And the core idea of the model is that anyone can and should be backing up that data on their own servers. It seems much more reasonable for someone to think that the data could be used for whatever they want in that model. That is the de facto ownership model on Nostr and fediverse content right now. You own the identity, but you don't own your data.

To be clear -- I don't think that's bad. I *like* the idea of that data being free and open when it's published -- who owns your words after you say them aloud?
But it does inform what data I put here. And I think that's a big shift for most people coming from large traditional platforms. We should embrace that distinction to help people's experience here. 
 > In a sense, data ownership on traditional platforms like Facebook and Twitter is governed by a terms of service, but on Nostr, it feels somewhat closer to publishing to the public domain. 

TOS are a contract. They only mean something because of the law.
Copyright law and privacy law still apply in the absence of a TOS document.
Of course relays and other parties can break the law, but the same would apply for mainstream platforms.

> Someone could, theoretically, be backing up your tweets, sure.

It's not theoretical, it's very doable.
This has been done before.

>  But large platforms do quite a bit to prevent that,

They can't prevent that. It's why there was an archive of Trump's tweets, for example.
Also tweets end up all the time on the Wayback Machine by the Internet Archive. I have accessed deleted tweets before this way.
In fact, backups of large portions of social media platforms have been made before by data hoarders.

> it's against their terms

People can break TOS.

> who owns your words after you say them aloud?

If they are copyright-worthy and recorded, the speaker owns them.

Mainstream platforms sometimes give users the delusion that they will be able to take things back, but they won't, or at least there is no guarantee that they will.