Why aren't those people still here?

Cuz we aren't very big. There is not a lot to pluck from here yet. You still have to invest
a lot here to get huge upvotes, for the most part. And that formula doesn't work as much anymore The formula here is not based on any advertising or "thumbs up" algorithm they can hack. And it's too much of a guessing game on getting followers. It's just not something they understand or want to fuss with. So they leave.