end to end encrypted between Facebook and you.

you don't trade off your security, instead you increase it.

for Bitcoin you can increase your privacy with various tools like coinjoin and lightning network with convenience tradeoff

or you just use Monero.

If you have questions feel free to ask in Monero@monero.town

You should check privacy coin Monero.

Matrix and XMPP is pretty much popular in XMR community

And often discord and telegram channels are bridged with other platforms.