I think the problem with such places is, they just become a dump for self-promotion by people who otherwise don't participate at all. The opposite of an actual community. That's why even reddit used to have a 10-to-1 rule of thumb about posts like that (which would be very easily gamed today).

Yeah, I think you're right. Asking people to give feedback and contribute instead of just self-promoting is like expecting everyone to maintain a 1:1 torrent ratio - it's just not gonna happen.