I feel uneasy about Signal being an app centralized in the USA, but it is the only one streamlined enough to be usable by non tech-savvy friends and family. I wonder if it will fall prey to Chat Control in Europe, so the time to explore alternatives will soon be upon us.

So far, I have heard of XMPP, Matrix, Delta chat and SimpleX. Never got friends to switch to XMPP or Matrix for more than one conversation, so I guess we're just f*cked.