How they try and centralise everything, and make it too easy for people to brigade communities they don't like. Something that's federated would probably solve

How they try and centralise everything, and make it too easy for people to brigade communities they don't like. Something that's federated would probably solve a lot of the issues Reddit has for example, as well as a lot of the controversy over Twitter's ban policy (by letting communities have their own guidelines that don't affect the entire service).