[rswail]

Keeping credit card details will expose private companies to the requirements of PCI to store them. It's against those rules for private companies to keep the cardholder information connected to the card details like the PAN. The PANs aren't even allowed to be stored unencrypted and access to them is subject to PCI as well.

Plus it means that people that don't have those forms of identification will be restricted from using the internet. Libraries won't be able to offer a lot of services, the "unintended side effects" are enormous.

But never put it past this particular British government from establishing the very best in footguns.