The entire point of this subthread is that this way of doing things is garbage. Banks shouldn't be allowed to deny transactions because they "know" it's fraud, but we've allowed our governments to force them into the position of doing law enforcement, something we should not want them to do. But people who think the government should outsource its responsibilities seem to think this kind of thing is a good idea.
Similarly, a payment processor shouldn't be allowed to deny a transaction because they "know" it's human trafficking. Evidence of such a thing should be given to law enforcement, and due process should determine what, if anything, is done.
Denying a payment isn't the same as putting someone in jail and therfore shouldn't require the same standard of due process. Allowing a business to accept credit cards is not a basic human right.
Similarly, a payment processor shouldn't be allowed to deny a transaction because they "know" it's human trafficking. Evidence of such a thing should be given to law enforcement, and due process should determine what, if anything, is done.