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Re:Tumblr has lost 30 percent of web traffic since December by tetrep on Friday March 15, 2019 @07:47AM (#19398750)
What you want sounds within Reddit's normal use case. If it's not a site feature, it's a feature of automod: https://www.reddit.com/r/AutoModerator/

There's a lot of subreddits configured to only allow text posts, one of the subreddits I frequent is configired to delete your post if it is an image post that doesn't have a top level comment by the poster, as the subreddit rules require all image posts to have text descriptions (to guide conversation/mitigate low quality posts).

I don't Tumblr so I don't know the full use case for tags, but from what you've described it sounds like flair: https://mods.reddithelp.com/hc/en-us/articles/360010513191-P...

Re:Tumblr has lost 30 percent of web traffic since December by alleyshack on Friday March 15, 2019 @12:12PM (#19400990)
Automod is an automatic moderator, not a curator unfortunately, which is what we really need.

Tags are in the same general family as flair, but they're distant cousins of each other. Reddit generally expects one flair per post, and for flair to be short. My blog uses a minimum of three tags per post, with around 95% of posts having four to seven tags. A couple of those could go away due to the difference in how flair and tags are used, but that would still be at least two flairs per post on most posts. It also still doesn't solve for very long tags.