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ProtonMail provides information used to identify email owner...
(www.404media.co)
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
much thanks to @gary_host_laptop for the logo design :)
Proton uses Chargebee for payments, which has its own data retention policy of essentially "as long as we want to", but Proton does themselves keep limited data like the billing name, and last 4 digits.
Proton's privacy policy says nothing about a pre-set time delay after which they'd delete that data. They only claim that they "reserve our right" to remove your payment information if they think it's no longer valid. So theoretically, that might mean if your card's expiry date has passed, but that's not a confirmation.
The best way to reliably make sure Proton wouldn't have any info on you is to not have ever tied any real information about yourself or your payment info to that account.
Thank you for the information.