Yeah but those services tend to care a lot less then the payment processors but the I do see your point.

For instance, it's not as easy as you think to get a website pulled down, or to get a domain name restricted, mostly because they're not paid for on a monthly basis, they're paid for on a yearly basis, and sometimes they even have contracts for multi years.

Different clouds support different things, that's why sites like Parlour still exist despite the massive amount of animosity the administrators of that site face.

Getting a hold of a global register to get them to do something about a domain name on their register, while possible, is not nearly as easy as getting hold of the payment processor.

It seems to me that if payment processing was made to be less effective by this tactic, they would have to choose less effective tactics that sites could choose to ignore. You're right that they don't own the hardware, but for big companies like Valve, it would be a pretty trivial setup for them especially with companies out there like open cloud.