As an instance admin I can only say that there was a steady stream of sign ups from robot-like accounts, until I required accounts to write a motivation for sig

As an instance admin I can only say that there was a steady stream of sign ups from robot-like accounts, until I required accounts to write a motivation for signing up and then got rid of maybe 80% of new account sign-ups. So I'm only speculating that a lot of that 80% were automated sign-ups. Why create a bunch of fake accounts on fediverse nodes? I don't know, maybe they're used as currency later, or manipulation if the platform takes off. Who knows. These are only my observations.