I don't have a link, but I've noticed that quite a few videos in the similar corner of topics need an "age check" (e.g. https://www.youtube.com/watch?v=_2khAmMTAjI , the creator of which was (according to them) visited by DHS for "anti-american sentiments" [1] )
So glad you mentioned this, I've also noticed this. Agreed, it's scary and crazy what happened to JT Chapman/Second Thought. This 'age check' is also a pretty convenient way for Google to 'passively' create a list of people who watch "anti-american sentiment" videos.
Yea, I've been seeing this more and more on what seem from the outside like fairly innocuous vides and was yesterday accomanied by a prompt on my mobile that I 'need' to add my age.
This was mandated legally by the European Union for videos that are not suitable for minors. (I assume this one contains gore or something like that? I haven't watched it)
