The case you shared in fact shows that the Proton's encryption ensures privacy by default and that it cannot be bypassed even when we're presented with a court request that we cannot legally contest. Namely, weren't able to share any of the user's email content due to zero-access encryption which makes it inaccessible to us: https://proton.me/blog/zero-access-encryption. All we could provide was the limited metadata we need to have access to anyway in order for the email service to work properly. Additionally, the user's identity had already been known to the law enforcement. As any legally operating company, we need to comply to the local legislation.

There is also no comparison between Crypto AG and us. Our encryption occurs client-side, our cryptographic code is open source ( https://proton.me/community/open-source ), and our tech can and has been independently verified. More about this here: https://proton.me/blog/is-protonmail-trustworthy

Finally, regarding payment in cryptocurrency, you can also pay for Proton's services in Bitcoin: https://proton.me/support/payment-options#bitcoin.