You want proof. First Data made a ton of money off of IBILL. Now they do not need them anynore because of the money they made.
There is no such thing as money that is to good.
Sorry fact is Large institution's are a collective entity its wishes are vague and the action's of those institution's decree that Porn is not worth the adventure in the landscape of other opportunitistic financial gains that compose the money making field's of business.
Blame god, blame morality, blame Visa...
Who knows.
But clearly its a collective decision no matter how you look at it.
Not all horses feed from the water given to them in a desert.