For example, YouTube does this with some LGBT content. YouTube has demonitized LGBT content and placed it in restricted mode, which screens for "potentially mature" content[1][2].
YouTube also shadowbans the content[1], preventing it from showing up in search results at all.
From here[1]:
> Filmmaker Sal Bardo started noticing something strange: the views for his short film Sam, which tells the story of a transgender child, had started dipping. Confused, he looked at the other videos on his channel. All but one of them had been placed in restricted mode — an optional mode that screens “potentially mature” content — without YouTube informing him. In July of that year, most of them were also demonetized. One of the videos that had been restricted was a trailer for one of his short films; another was an It Gets Better video aimed at LGBTQ youth. Sam had been shadow-banned, meaning that users couldn’t search for it on YouTube. None of the videos were sexually explicit or profane.
There are more examples like that here[2].
[1] https://www.rollingstone.com/culture/culture-features/lgbtq-...
[2] https://www.washingtonpost.com/technology/2019/08/14/youtube...
Then there is tumblr, which is all but dead - explicitly for a "think of the children" concern from apple.
Tumblr had their porn ban decided 6 months before the snafu with the app and CSAM. It's nothing to do with Apple.
I find it intensely ironic that Apple's CEO is openly gay.
I think many queer people have a completely different idea of the concept of "why do you want to hide if you're not doing anything wrong" and the desire to stay private. Especially since anything sexual and related to queerness is way more aggressively policed than hetero-normative counterparts.
Anything "think of children" always has a second order affect of damaging queer people because lots of people still think of queerness as dangerous to children.
It is beyond likely that lots of this monitoring will catch legal/safe queer content - especially the parental-controls focused monitoring (as opposed to the gov'ment db of illegal content)