@loke I've been tempted to become a paying user during ProtonMail "Black Friday sale" but my train of thought always ends up with doubts about security when dealing with any centralized service, it's a convenient target.
Sure, I pay for several services on the web, but they don't claim to be secure, or at least it's not their main selling point. Besides, storing the private PGP keys in the web/cloud (someone else computer)? Nah...don't think so...