I definitely agree that requiring a link-via-IRC might be too high of a barrier. Even for someone like myself who's used it for decades in the past, but doesn't use it much any longer, it might be a sufficiently high burden as to preclude registration, thereby driving repos toward alternatives.
With regard to these recent requests, I did post a response 10 days ago to
this /lisp post indicating that hosting the quicklisp library repo in our gitlab might be a good alternative. That made me think perhaps some of the uptick in requests were legitimate.