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Why not implement a simple algorithm:

If your past 5 comments have not gotten more than 3 cumulative upvotes from ranking users then your commenting is throttled to 1 comment per day

If your past 5 comments have a cumulative negative score your commenting is limited to 1 comment per week

There is no pending comments list, only a message telling you: sorry, try to post higher quality content to be able to comment more often. You will be able to post another comment tomorrow / next week

New users are limited to one comment per day until they get at least 3 cumulative upvotes in the last 5 comments

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