I think Web 3.0 is going to be more focused on small communities and niche-focused platforms. Look at how many people shove money to twitch streamers and YouTube personalities that have minimal operating costs but extremely strong communities.

The whole reason companies like the web is because it provides high profit margins since compared to physical things, the web is incredibly cheap. Communites allow companies to make money off of feelings and comradre that their users build for them. Twitter doesn't have sense of community so people are quick to leave, but even if pewdiepie left YouTube, the platform would be fine because it has so many other niches that people would stay for.