I am using https://lichess.org/ and prefer it over the native iOS App for this free chess website. It is in fact a smoothly running PWA and even supports notifications (e.g. to remind one to move in correspondence games).

Same goes with Voyager ( https://vger.app/ ), that was used to create this post.

F* you, Apple!

Not being end to end encrypted by default is the opposite of privacy.

Yes, there is https://mattermost.com/

This is exactly what I would prefer even without being logged in!