It’s so easy to switch from one instance to another (in fact many people advocate having alternate accounts on multiple servers as a rule). Anyone can start a community and truly moderate it how they choose, or choose a server with the rules that they choose. It’s not surprising that the Federverse has succeeded in creating spaces that are much more healthy, especially for vulnerable people. It is impressive how stark that difference is; harassment and abuse are accepted as given on just about every corporate media, with very little recourse.