In a moment, I'm gonna roll out the most naive ratelimit implementation I can build:

New users start off with a 5 minute ratelimit. For every post they make, the ratelimit drops by 30 seconds, thus the ratelimit goes away after their 10th post.

It's not very polished yet, but I want to test it in its current state before polishing it. The polish is the hard part. :lol

Also, the ratelimit is by IP address so that spammers can't just switch accounts without also switching IP address.