He did not spend much time on discussing the alternatives. And I think that's understandable given how large a topic that is in itself.

The main topic he is discussing is content moderation, which I am guessing might also be a challenge in Fediverse.

One major point I think he missed is websites which not just lets user post content but also actively promotes some of the content. On Fediverse I only see the content posted or shared by people I follow. But on sites such as Facebook I am constantly shown content I never opted in to.

I think that promotion of content gives Facebook a much larger responsibility for the content than they otherwise would have.