Yes it is. /u/ProtonPrivacy@lemmy.world is an official account from the Proton team. While the team is currently not posting here at this moment, we both /u/alex_herrero@lemmy.world and myself are here to answer your questions. We are also moderating the Proton subs on reddit.
Sure! As official as it can get!
BTW, the right main user is /u/ProtonPrivacy@lemmy.world
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