"For the Fediverse to thrive, it has to be the broadest possible ecosystem of contributors?"
Um... no? I mean, obviously not? The broadest possible "ecosystem" includes all sorts of "contributors" that would not help at all with its thriving.
The Fediverse doesn't need spammers, doesn't need crypto frauds, doesn't need white supremacists and covid truthers and qanon and people calling in bomb threats on libraries and... None of those groups are helpful to a system thriving.
Is this not obvious? Or do you mean something by "ecosystem" and "contributors" that wasn't clear?