Divide and conquer. Non state-actors and special interest have a far easier time attacking a hundred small entities than one big one. Because people have much less bandwidth to track all this shit than it is to spread it around. See ALEC and the strategy behind state rights.

In the end this is about economic power. The only way to curb it is through a democratic government. Lemmy servers too can be bought and sold and the communities captured that grew on them.

Easy. Nationalize social media and turn them into democratic cooperatives with the mandate to enforce strict moderation on hate speech.