I was building something like this for personal use but for Reddit to beat my reddit addiction (before they fucked up their API). I called it Detox for Reddit

I was building something like this for personal use but for Reddit to beat my reddit addiction (before they fucked up their API). I called it Detox for Reddit and you could connect your reddit account to get your subreddits and then it would check distribution of scores for that subreddit and only send you the really good stuff in a daily digest e-mail. The idea was that it would prevent the FOMO that made me check Reddit more often to avoid missing the good stuff among the sludge. I wasn't planning on monetizing but monetization strategy would have been a limited number of subreddits (3-5) in a free version, all your subreddits in a small monthly subscription (like 1-2$) and then a larger fee to enable NSFW subreddits. If reddit allowed them, I would have advertised directly on reddit in ADHD and other relevant subreddits like Productivity etc. So I like your idea, I think it works as is but would be enhanced by having customizable thresholds or actual calculation of outliers so you can say give me the top 5% or 1% of posts.