I suspect you'll create a lot of work for someone.
The rule for Movies&TV becomes: "Post about movies, but not those movies". The criteria seems a bit vague - Barbie and Oppenheimer are obviously new releases, but is They Cloned Tyrone? If the criteria is "New releases that we're bored of seeing posts about", the posts need to happen before a decision can be made.
Also, at the risk of seeming obsessed: if you're seeing a lot of Oppenheimer / Barbie posts, they're mostly from one user. If - let's say - a user from KBIN was posting here for movie stuff, but posting all their other opinions to exploding-heads.com
, then you may not be able to expect the level of engagement required from them to accurately discern where their posts should go.