Wouldn't they have to validate a paying customer to tie it to an IP aswell? If there is a point where a user is identifiable, it can't be rolled back with a "trust us" in my opinion if the focus is privacy.
Sometimes service providers on the internet try to accomodate "anonymous" payment via wire transfer or other non-credit card payment methods. VPNs are one example. Whether this is significantly "anonymous" is debatable. An obvious question is whether the service provider retains payment information after payment is made and if so, why. To provide service, arguably the provider only needs to know "this IP address is paid up through [date]". It does not need to know "this IP address is associated with [user]". It does not need to collect or retain any information about [user].
