> forcibly prevent competitors from arising by leveraging their control over resources or a legal advantage
User visibility is a resource. While overwhelming popularity is not the same as a Monopoly (since they are from 2 different perspectives, they can't be equated), the effect is often the same.
It isn't a resource that Github controls, it's a resource that the user timeshares to Github. It isn't like steel or oil or fiberoptic cable, where it's infeasible for a new entrant without Github's resources to compete for user attention without insurmountable effort.
OP could have spent their blog post informing users that the project would be hosted elsewhere, rather than going on a rant comparing Github to the Nazis, and that precious user visibility wouldn't have kept their userbase from moving elsewhere.
Oh wait, they did, at the end of their post. So... why are we even here then?
User visibility is a resource. While overwhelming popularity is not the same as a Monopoly (since they are from 2 different perspectives, they can't be equated), the effect is often the same.