But still porn is only a small subcategory of the content the article was discussing, and probably most content being rejected as "adult" or "nudity" or "explic

But still porn is only a small subcategory of the content the article was discussing, and probably most content being rejected as "adult" or "nudity" or "explicit" is very much not porn. It may be informational content about sex, or fine art with nudity, or lyrics using sexual words for shock value, or... I think many platforms actually are uncomfortable with hosting porn not just for legal reasons, and that the problem you're describing of identifying what is what and drawing lines is rather between porn and not-porn-but-sexual than between illegal and legal porn.