Nice to see these kind of collections, I've been spending a lot of time recently running old CP/M software and there is a wealth of the stuff available.
Fun to go through text-based games written 20+ years ago, and even if I completed one a day I suspect I'd be dead before I'd played them all.
Archive.org will probably take a lot of stuff but they have to be very conservative about what they make available, due to their high profile. OP mentions the UTZOO usenet archives which apparently are no longer available there, likely because someone asserted a copyright claim.
Fun to go through text-based games written 20+ years ago, and even if I completed one a day I suspect I'd be dead before I'd played them all.