No, a Lemmy instance can ban you, and that won’t/can’t ban you from creating a new account on another instance.

But, that said, instance admins do talk to each other, and if you’re being a dick everywhere, you might find yourself getting less benefit of the doubt.

I use Matrix with a group of friends that I persuaded to move from Discord. We still use Discord’s voice chat, but now that Matrix is starting to have something similar, I might try to get them to use Matrix for that too. So, the usage here is just general groupchat-like stuff.

I’m also in the process of moving the student council I’m in from Discord to Matrix. Once that’s up and running, it’ll cover groupchats, coordinating and announcing events, channels/rooms for various courses, and discussing/organising the various things the student council does.