Ok, but if it’s not bound to something like an official domain name how can you be sure the person who signed their posts as president of the EU (or whatever the official title is) to actually be that person is real life?

For what it’s worth, !ich_iel@feddit.de (hope I got that link right) brands their memes with a Lemmy watermark

You probably figured it out by now, but you don’t need to create a new account for every instance. You can just go to www.yourinstance.com/c/community@otherinstance.com and comment or subscribe there.