Advertisers don't like it, and won't advertise where there's porn. Advertisers pay for most of these websites' existence. They capitulate to the demands.
Advertising is the big one. Many companies simply don't want to advertise anywhere where porn is present even if it's segregated.
Payment processors is the next big one. Most processors won't service porn sites which makes it hard to collect money for sites with porn. You get stuck with worse service and higher rates.
Legal compliance is another big problem. Lots of countries have lots of different laws and operating a porn website can get you in trouble in places you weren't aware of if you aren't careful. You need to verify ages, and consent of both users and models. In some countries simply looking younger than 18/whatever age can be a problem.
Overall if a site has mixed content, it can be much less hassle and much more income to drop the porn if there's sufficient non-porn content.
My guess is that certain companies are concerned about repercussions related to porn related content due to an impending buyout or IPO. Personally I don't blame them.
Advertisers hate it, payment providers hate it.
Fediverse has recently been attacked by CP spammers, and instances like the one I'm on has actually shut off image sharing all together.
Moderation is a problem globally, even if this content slips through automated filtering there will always be exposure, and always people affected. And unfortunately the tolerance for CP or even copyrighted content is precisely zero due to public backlash and the news articles.
Seriously, don’t even leave this site, just go to the search bar and look up whatever you’re into, there’s probably a comm specifically for it. Even you sounding freaks.
Because people don't want to look at other people's unusual niche kinks and try to identify if it contains children or other non-consenting participants as a part of their employment. And then try to explain to the people about why the unusual niche is against the rules when they receive a complaint about its removal. Amongst so many other reasons.
Programs and apps on the internet are not simple things and user-generated content can be a very malicious and dangerous thing to have a copy of. The legal risk alone is not worth it, let alone the effort required to enable a slightly easier masturbatory experience for total strangers.
I see so much porn on this site lemmy alone... scroll by new and hot, and you find tons of it... it's actually kind of annoying how often I see naked chicks and dicks and more on this site compared to others that do good at censoring it from the front pages...
I think it's bad parenting. The loud, obnoxious ones who can't be bothered to keep an eye on little Schlemmy, so they sit him in front of the TV computer for hours. And when he inevitably comes across something he shouldn't, is that their fault for not paying enough attention and making sure he uses appropriate sites? Of course not.