I did a secure communication experiment with a friend a while back. We gathered the public ssh keys of people we wanted in the group, then one of us would spin up a stock OpenBSD vps, add user accounts and ssh keys, and we would ssh in to communicate. 
the stock install has enough old school BSD communication software to work.
After chatting and/or exchanging files, we could log off, and destroy the vps.
Then do it again, with a script to automate account and key additions.
I also learned that its possible to zip a Veracrypt container into a .jpg. Just fyi.

didn’t come up with a name for these experiments, but something like Samizdata would do. 

 That is...awesome.  

 I love this idea. I have been fascinated with building custom ssh servers for a while. done a couple chat rooms, as well as some random experiments like the game wordle. feels like magic to use ssh as a client for custom apps. 

 its my favorite. i dunno why.
i just love it. 🤓 

 OpenBSD they only OS I would imagine doing this with 

 How do you do the veracrypt jpeg?