I think it’s been asked about before Game Database (Pro Games) and possibly most recently Feature Request: SGF Library viewer and links therein.
In theory we could make a thread where games are uploaded to people’s sgf libraries and links to those games are maintained in a list like the above (assuming it was ok for mods/anoek etc) but maybe it’d be better in a separate thread.
Maybe one problem with many users uploading sgfs separately is just there’s always a chance that someone forgets they are using their library to host certain games and deletes them and the links die in the thread. If it’s centrally organised in the forum duplicates in theory shouldn’t be a problem.