For some reason I have it in the back of my mind that they were at one point accused of being a honeypot for US intelligence because of their association with MIT. Probably complete BS, but maybe not. Are they as open source as they claim to be? Looks like they’re on github. F-Droid seems to think they have some Google libraries or whatever that they use.
ProtonMail users, how do you like/dislike it?
it’s worth noting that protonmail has an onion and their clearnet server also accepts tor connections. So users can control the leakage of their IP… but only if they’re willing to solve countless CAPTCHAs.