Piracy

Picking an instance that aligns with your values is fair enough -- except that if you're just joining for the first time then you probably have no idea what values each instance has; or even what kind of values you might be looking for; or how you might find out; or whether they are big or small; or reliable long-term instances or throw-away hobby projects.

... Like, most of what you need to know to make an informed choice only is revealed after you start using it - i.e. after you've already made the choice.

I've heard a suggestion of having a kind of 'newbie instance', where you just join by default to get a sense of what's going on; and then later choose an instance that suits you. That would make it easier to make an informed choice later; but also probably be even more confusing - since you'd still be thinking about instances and stuff, and also that you have to move sometime... it probably creates more problems than it solves.