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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 :)
Are they required to keep the data?
Not sure about Swiss laws regarding merchant payment card data retention... But they aren't really going to matter with this situation either way. Even if Proton doesn't keep any identifying information directly, the payment processor for sure is going to keep identifying data. Proton will have a confirmation number for the payment being processed, which can be correlated via the payment processor anyway.