It's wild they cut anyone that makes anything with incest, beastiality, and the other. But technical robbery is a pass lol.
That's on the part of investors who demanded objectionable content to be cut. Simple as that.
Now, the reasons for that are many, but they either fall into abetting crime (because incest and bestiality is a crime in most jurisdictions) or because of bottom line, because apparently for more objectionable content, there are much more frequent chargebacks and demands for refund. Billing operators dislike handing out refunds, but they flat out hate chargebacks, and for good reason.
Every chargeback is investigated and it's the billing operator that has to pay out of pocket if the chargeback is unsubstantiated (when service was delivered, but the customer was just dissatisfied and issued a chargeback request).
Worse still, if there are enough chargebacks, credit card companies can stop providing services to the billing operator and it's a death knell for them.
That's the reason why the likes of Epoch or CCbill collect charge 40-60% in fees.
As for what constitutes objectionable content, there are two good examples: Met-art was forced to remove some sets which showed models looking underage (like Josephine by Peter Dominic) who was photographed at the age of 21, but looked "too young" and CCbill demanded they take her sets down. Same was for that one photographer who was found to shoot underage models and there were accusations of abuse, all sets by him were taken down because of fears of problems with paperwork he submitted even for models who were clearly of age.
Another problem is that these companies go through paperwork and Karup's sites were forced to take down a lot of content in 2009 for sets and/or models which didn't have complete paperwork on file or where the paperwork was not suitable for any reason. It was a strange situation because they could compile the correct paperwork if they wanted to (as studios that licensed those pictures still existed), but decided it wasn't worth the effort, which was all the more odd as other sites like ATK had the same models and sometimes even the same sets and they didn't take them down (ATK did take some sets down, but it wasn't a site-wide purge of 80% of 3+ year old content, it was more like 2-3% content removed).