There is all that crap, and then there is https://sphinx.chat/
reply
Signal, of course
reply
Yes, currently it's the best option. The need for mobile number is really annoying though and breaks privacy if you want to join groups with many people.
reply
Nostr (anigma.io for example) Matrix (Elements app for example)
reply
Neither is great for privacy... Matrix is leaking all metadata, server has full view and a lot of groups are public anyway.
reply
Then probably Threema but it's hard to get people to use it as it isn't free (Can be paid with Bitcoin)
reply