Reddit has just changed the rules so moderators of subreddits must get admin approval to switch from public to private, as originally reported by The Verge. This is being seen by many as an attempt to curb sitewide protests, as these requests must be approved by Reddit staffers. There will be no way for multiple subreddits to go private at once without Reddit having its hand on the lever.
The company put a little note on the support page that reads “if you’re changing your community type after community creation, you’ll need to submit a request.” This page doesn't offer any reasoning behind the decision.
We reached out to Reddit to inquire about this most recent policy change and the company pointed us to a post on the subreddit r/modnews written by VP of community Laura Nestler. She wrote that “the ability to instantly change Community Type settings has been used to break the platform and violate our rules.”
So it looks like last year’s protests are absolutely connected to today's changes. Nestler also suggested that this is an issue of personal responsibility, writing that “communities should honor the expectations they set – public communities should remain accessible to all; private communities should remain private.”