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Proton Mail provided user data that led to an arrest in Spain
(www.techspot.com)
This is a most excellent place for technology news and articles.
I mean... If Proton had no way of knowing your recovery email, it would be pretty pointless to set one up. If they do have a way of knowing it, they are bound by swiss law to give it up. No company is above the law, they have always been very transparent on that matter.