This isn't the only reason. People who are trying to get attention will flock to where attention is directed. For better or worse, centralized platforms are a g

This isn't the only reason. People who are trying to get attention will flock to where attention is directed. For better or worse, centralized platforms are a good place to do that. It's the same reason protestors, charity drives, people handing out free tickets to a new concert venue, do this in downtown parks and public squares, not their front yards. Popular photographers hold shows in galleries, not their own living rooms.