Yes, I wonder how we went from "9/11 never forget" to "Don't even mention the subject if you want to keep earning money for your effort in creating content" [1].

YouTube is weird when it comes to completely arbitrary demonetization (and the absolutely braindead idea of removing the downvote counter) because it's one of the rare plateform that get so much negative goodwill from content creator who depends on it to make some money.

[1] One famous french Youtubeur, "Joueur du Grenier" has to playfully bypass the subject by joking that "Nothing whatsoever happened between the 10th and the 12th September" while showing 2 plastic bottles being hit by paper airplane and then crumbling. He originally put real images of 9/11 while describing the early 00's zeitgeist, but had to do that instead since it caused the video to not be sent to subscribers (or demonetized to oblivion, I forgot which)