It's extraordinary that payment processors don't have any regulations that force them to serve businesses in a neutral fashion. It's weird that they're allowed to play morality police with the Internet even though they have no formal governmental role as such.
You'd think that once the government decides what is and isn't acceptable, the processors would follow that lead. But instead they go a different, more restrictive way.
I guess they want to be everyone's prudish uncle, instead of payment processors.