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Proton Mail Discloses User Data Leading to Arrest in Spain
(restoreprivacy.com)
This is a most excellent place for technology news and articles.
https://proton.me/legal/law-enforcement
Here the mention clearly the data mentioned in the privacy policy which in turns clearly states that you MAY provide a recovery account which will be associated with your account. I also think that anybody that should be concerned for this should understand that law enforcement can get ALL the data the company has on you.