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by NoMoreNicksLeft 5 days ago
A moderator has, presumably, chosen n posts, and by doing so has indicated that if you've downvoted (or upvoted, their choice) at least however many of those, you're on the shitlist in their subreddit. No AI needed, the moderator was the one to determine that you were criticizing something and that in their subreddit the criticism is unwelcome.

Where to allow them to do this with posts outside of their subreddit is an implementation detail.