Reddit communities will require permission while going private or switching to NSFW | TechCrunch
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Last year, while opposing Reddit's API changes, a large number of subreddits turned from public to private or turned NSFW (Not Safe for Work) to impact

Last year, while opposing Reddit’s API changes, a large number of subreddits turned from public to private or turned NSFW (Not Safe for Work) to impact ads on the platform. To prevent this kind of change, Reddit is bringing new rules where moderators will have to submit a request when updating community-type public or private or maturity ratings of SFW (Safe for Work) or NSFW.