Earlier quoted context omitted.
Certain banking regulations make those transactions "high risk".
Some of them are due to government regulations like 'don't launder money' and 'don't process money for illegal activities'. Which are, like, basic operations of society 101 level stuff. Others (adult services) are not due to government regulations, they are there simply there because banks don't want to deal with chargebacks.
No, that's wrong. Firstly, as others have pointed out, society long predates any such notions.
Secondly, determining what is illegal activity, and putting a stop to it, is ostensibly the job of law enforcement and the courts, not the bank.