But it's the same dev who's been active for over a decade and has a solid reputation. Users rely on these extensions. Removing a popular, well established extension without warning or apparently even making sure it was in violation of said policies to begin with is irresponsible.

And the specific extension in question being a popular ad/tracker blocker while Mozilla has been cozying up to the adtech industry lately and selling access to Firefox user data isn't a good look for Mozilla. Maybe Mozilla is just being grossly mismanaged but this is all getting noticeably suspicious.