My argument is more that people would prefer to not be on a platform where they are at the mercy of organized miscreants or one that is known for lots of illegal activity. So centralized platforms provide a layer of safety that people want. It's really hard to make a platform that allows broad speech, is actually decentralized/p2p (ie: rather than just federated), and is safe from organized abuse.

As for the government, I believe the government is fallible, corruptible and that privacy has value. The government can keep up but in doing so you tend to lose more freedom than you had before. For example, Australia's new laws on encryption which would, combined with mass traffic surveillance, lets them know everything you say. So I'd prefer the government not care enough to actually solve the speed regulation problem because doing so puts dangerously much power in it's hands.