https://techcrunch.com/2023/06/12/reddit-blackout-8000-subreddits-went-dark-protest-api/

Over 8,000 subreddits went dark or read-only in protest of Reddit’s API pricing, which will shut down many third-party apps like Apollo and Reddit is Fun because of the high fees. 

The blackout, which began on Monday and will last for 48 hours, is a coordinated effort between tens of thousands of moderators and millions of Reddit users. Participating subreddits will be private during the blackout, so that non-subscribers can’t view existing content, and subscribers can’t post or comment on new content. Some protesting subreddits will be in read-only mode. Participants are encouraged to speak out about the API changes by leaving negative reviews of the official Reddit app, as well as boycott the site in favor of non-Reddit platforms to dent its traffic.