If all the porn sites went away, I could definitely make due with YouTube. There's of course a subreddit about it (/r/youtubetitties). You can show breasts, even enormous breasts, in the context of breastfeeding, hand expression (which is an established fetish category on porn sites, and the ones made for the porn sites do end up on YouTube, and don't get taken down), exams, self-exams, reduction consults, augmentation consults, topless protests, artsy film and stage productions, and so on.

However, I have no idea whether any or all of that is also demonetized. So maybe it doesn't mean anything, I dunno. I just noticed it's kind of easy to misread demonetized as demonized.