The reason people flock to centralized services is to have an easier time finding the the thing that they want.
They often don't even have the chance to bounce off of indie services, but rather never find them to begin with. When they do find them, the discovery problem creates a high bounce rate.
This is why things like peertube struggle. Creators think their audience isn't there. Audiences can't find creators. No one makes any money.
On the flip side, youtube and facebook are built to maximize engagement, which means maximizing outrage in most cases, which turns them in to machines for turning people in to reactionaries.
alcinnz