I think advertiser friendly on YouTube typically means much much safer content than NSFW. Content creator’s videos are demonetized for even swearing once or discussing the wrong topic. One example I can think of was a video that was demonetized for saying “thou shall not kill” because YouTube said it involved discussions of killing.

TVs shows are marked with ratings in europe , but it's not like it's enforced, it s just a recommendation , and i guess there is some rule not to play adult stuff in the early hours. None of this is enforcement, and can very easily be circumvented. On the internet, it's hard-enforced