Put another way, Youtube has to moderate 300x the amount of content. I suspect (but do not know) that Youtube also has 300x the userbase and can possibly afford 300x the moderation.
Whereas what about weird videos that try to sell products to kids under the age of 5? What about anti-semites? What about subtle racism (Is that even something we want to moderate?) What about bullying?
The moderation space, and connectivity between peers, is orders of magnitude larger on youtube. Hours of content controlled for.
It's not clear to me that xHamster actually tries to remove that from their site. I wonder if this is just a case where the media reports about racist content on YouTube or Facebook, but not on porn websites, so comparatively it looks like porn sites are doing a great job moderating.
Xhampster only has a relatively few and relatively easily identified and relatively clearly defined things to look for, compared to youtube and faceebook and others, which have a universe of nebulous things to try to identify.
xhampster (probably) doesn't even try to figure out if something is subtly antisemetic or anything like that. If it doesn't have kids or an actual not-faked death in it, then it's ok.