https://techcrunch.com/2023/06/22/reddit-is-battling-against-moderators-marking-their-communities-nsfw/

After adopting different forms of protest like exclusively posting John Oliver pictures or changing the topic of the subreddit, moderators have rebelled against the company by marking their subreddits NSFW (Not Safe For Work).

Protesting API changes made by Reddit, moderators are making their subreddits NSFW and loosening the rules about what users can post. In April 2019, the social network changed its policy to disallow ads on NSFW subreddits. So protesting communities are changing their status to try and affect the company’s ad revenue and get them to listen to their demands.