Go to https://wikileaks.org and enter a keyword into the search bar.

Conversations for android is an example of a good XMPP client.

Yea, nah…

The protocol is worse for privacy

‘Trust me bro’

Phone numbers are no longer required iirc

Phone numbers are still required to register and maintain an account. Only difference now is you can choose to hide it from other users and give people a ‘username’ to look you up with instead.

Matrix and XMPP are not alternatives and are worse for privacy and security

XMPP is exactly as good or bad for privacy as the servers and clients you choose. It’s a protocol, not a service. Unlike Signal, which is a brand/app/service package.