It hasn't really stopped exactly. The same torrent site that everyone gets their roms from has like 40 gigs of unmamed arcade dumps available. As for "beta", that was guru-choc I think doing that so it's gone when he quit. The reason nobody else does it is probably because it's just more work. I'm sure it's more than enough trouble already to get a new torrent out for every u release. f205v's site has it sort of though but not put into packs.