The ad cancer was part of my original motivation for downloading dumps. I've now found a a lot of Fandom wikis have links to their dumps you can't actually download because they're on S3 buckets that require keys or have download limits. It's infuriating and I think maybe I'm lucky I grabbed a few dumps when I did.

Fandom is usually the first example I think of whenever I hear the word "enshitification". First Wikia ate all the independent wikis because they offered free/managed MediaWiki hosting. Then slowly started making Wikia worse until the full Fandomization. Now the site is literally unusable without an ad blocker and all of that GFDL content on the site is locked behind obfuscation and incompetence. I desperately miss the old Wookiepedia and MemoryAlpha.