Banking KYC isn't about making sure people are authorized to bank, its about making sure the government is able to track them down if they are (determined by the government to be) associated with bad things.
The purpose is not the same as checking ID at a bar.
(Now, there's an argument that, for porn consumption, the purpose of any ID requirements should be like a bar and not like banking KYC, even if for porn production or distribution, there is more of an argument for a banking KYC-like regime.)