Here is also an excerpt from the answer by protonmail about the same questions put to Kolabnow. The answer came 6 days later with an excuse they have too many emails (which I read as a hint about what support you can expect):

Unfortunately, we have hundreds of emails per day to answer.

For how and why we are superior to Lavabit I encourage you to find an unbiased source (not us or them) and see for yourself.

As for CPU's being vulnerable, that is possible but we offer the best possible security. We dont intend to manufacture our own chips. Not sure what answer you're looking for.

As for quantum, we are adding EC support to OpenPGPJS and to ProtonMail as well in the coming months.

Sorry for the sparse answers.

Best regards,
The ProtonMail Security Team

After further questioning:
Our threat model is here:

Obviously if you don't trust your device you can't trust anything that runs on it. So we don't propose to be immune to device level compromise.

We offer encrypt-for-outside for non-protonmail users.

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