Perhaps someone will see them and be inspired to revitalize them.

But you are also asking for MANY judgement calls from the mods. What constitutes inactive? No posts for a week? A month? What if no one posts, but many people read them? What if a community is ‘active’ but only posts once per month? What if a community is very active, but only seasonally? What if it’s a community for people with birthdays on leap day?

Do you see how much you are asking on top of what they do already? You would have to have mods dedicated only to doing this. It isn’t worth it. Also, fuck reddit. This isn’t reddit.