There was a good post on /r/SubredditDrama/ today about this:

https://www.reddit.com/r/SubredditDrama/comments/1xl48fx/do_...

A reminder that all of the largest Proton subreddits (r/ProtonMail, etc.) are moderated by Proton employees themselves. Linked sub is community-moderated.

Proton should release their own reddit too lol.