But we DO have strong precedents of previous decentralized services/communities destroyed by the presence of huge corporate networks!

This is not just people going "Meta bad! Blocked!" as you seem to be arguing, this is the only possible reaction if we want to keep what has been build alive and not be razed to the ground, many of us saw this with our own eyes, me included, either we stop Meta at the door or the Fediverse is going to die, they have zero intentions or incentive to play the good guests here.