I highly highly doubt that Visa had any knowledge in this. PornHub may be a big company but they have to be minuscule for a company like Visa.
I really don't want this to turn into a case where payment companies are reluctant to do anything that is mildly controversial and could be turned against them at a later point. Think Pot (which I know many don't do right now thanks to federal laws but hopefully that changes soon), alcohol, other legal adult services, etc etc.
This just feels like the steps towards a more puritanical America. One that looks at sex, porn, and similar things as immoral and "dirty".
Also why Visa? Are they going to go after the bank(s?) that PornHub used to store their money? The banks that customers used when making the payments? The datacenter(s) they used? The ISP that carried the data around?
PornHub? Yes that makes sense. But anything past them just feels like it's grasping at straws.