I was hoping KiCadCloud would turn out like that, but there was no ratings system. It was also a bit difficult to search. Kicadcloud went offline a while ago.
To be honest though, I'm not sure crowd sourcing works really well for technical data. It still really needs a curator (otherwise users put random tags, or none) and some approvers to give a consistent eye to quality. Regardless, it still needs an admin to run the web server, keep out hackers and vandals, do updates etc, all of which takes a lot of time, and no one really wants to pay for the service, adverts are perhaps the only revenue source, and such a site probably has a low click count.