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?
https://web.archive.org/web/20210710030151/https://twitter.com/ProtonMail/status/1309380464118030342
and
https://libreddit.pussthecat.org/r/ProtonMail/comments/b847n7/it_has_been_7_months_since_protonmail_said_we_are/ejysilb/
Have a look at their Wikipedia article as well:
“The source code for the back-end remains closed source.[26][27] However, Proton Mail released the source code for the web interface under an open-source license.[28] Proton Mail also open sourced their mobile clients for iOS and Android,[29][30] as well the Proton Mail Bridge app.[31]”
Thanks!