There's obviously bots, but some folks do multiple accounts as default (I do for sure), and others just want to have a bit of padding against instance failure. Others don't realise you don't need to have an account on an instance to access it lol.

Others don’t realise you don’t need to have an account on an instance to access it lol.

this, i think, is going to be the biggest hurdle for getting people to join the fediverse. we need seamless ways to view and subscribe to magazines on other instances than our own. either that or we need one to get big enough that it simply eats the smaller instances.