Personally most my moves away from online platforms over the last 3 decades years have been been because community owners have massively fucked up.
I think Digg did it worst.
I think Digg did it worst.
They all kind of exist, but they were mostly supplanted by bigger, more centralized things. All of them had a part in their own demise, too.
Then in turn those bigger, more centralized things have tended to screw things up.