yeah, like OP isn’t realizing that they’re going to just make another Twitter
if you have it that there are no rules against shittiness and bigotry, then the worst kinds of people will decide to hang around and will drive off everyone else; you’ll have a nazi bar
that’s not the point; the point is to not have a single group dominate the site and to make it easier to avoid bad actors (bigots + fascists, because there’s a lot of that online) by just blocking the instance they live on
the “one single account” thing is a bonus, but definitely not the main reason for federation