In Dec. 2020, Pornhub had to purge any videos uploaded by unverified accounts due to the amount of revenge porn and child SA content that were up on the site, as well as the group who spearheaded the campaign being a Christian anti-porn group. They made such a racket that all the major credit companies were going to not allow any transactions made to PH go through. This lead PH to make all videos from unverified accounts inacessible, albeit temporarily, as well as removing videos that violated their guidelines. Many vids to this day haven't come back up.
In the article I was reading about it, out of their millions of vids, they only had 118, compared to FB's in-house number of 58,000. It's hard to notice under vast amounts of legal content. I will also say it's likely that these were vids of teens not actual children, making it easier to slip by