Mullvad already did this for anyone who wanted port forwards, because those people are more likely to be the target of legal demands. They seem to never actual

Mullvad already did this for anyone who wanted port forwards, because those people are more likely to be the target of legal demands. They seem to never actually associate the account number with any payments except at the moment the account gains time. This keeps them from having to respond to any legal demands with useful data. I wonder if the iOS subscriptions are affected. Technically they could just not associate your payment with your account number. Then the app can submit the transaction ID and your account number that was stored locally to the service to extend your time.