3. Moderation is still an unsolved problem, in that bad actors can only get acted on 𝘢𝘧𝘵𝘦𝘳 the damage has already been done. Centralized platforms can actually get out in front of this easier because they can at least implement some pre-screening during signup. The fediverse signup process is completely unmoderated, as bad actors can just use bad platforms (or their own) to launch their harassment from.
3/