Every single (semi)-erotic artist i know has faced a daily struggle of avoiding their work (and livelihoods) being demonetized somehow - whether it be shadowbans, straight up sudden bans, deactivations of accounts under false pretenses, etc. One could argue there's a difference between 2D art and "live action porn' but I'd say as an artist the line is a lot fuzzier than most think, as there tends to be a suspicious amount of activist work that tends to get shoved under the "porn" rug because it makes it easier to hide dissenting minority opinions.
The existence of power-centers like giant social media monopolies guarantees they are targets for political interests to hijack that power & censor opponents. Even if you could snap your fingers and magically populate these dominant platforms, and media/journalist institutions as well, with good faith actors (even here they are limited by their ability to actually know what is true), this wouldn't be a stable equilibrium and would in short order be populated and/or lobbied/pressured/swayed by political opportunists.
It may be true that it's hard to draw a clear line between bullshit and almost-bullshit, but it's hard to draw a clear line between porn and almost-porn and they somehow manage to do that okay.
edit because apparently this wasn't clear enough: the way you distinguish science from bullshit is not by evaluating the claims (that's what I am arguing we should not trust Facebook to do). One is a money-making endeavour and the other isn't, and that's the basis on which they are distinguished. Even the worst science is not festooned with ads.
I'll say it again: "Facebook doesn't do a good enough job of evaluating accuracy" is a trap, and it's a trap they desperately want you to fall in to. If we get to the point where we put any value in FB's evaluation of any scientific claim, we're already into dystopian sci-fi territory, no matter how good a job they do.