Is there a specific reason why this sub specifically doesn't mention "don't bring up other K-pop groups"?

I checked BTSSnark and TwiceSnark and they have rules where you can't mention other groups because snark subreddits should be ran by people who are neutral and want to give unpopular opinions, criticize and hate on a group that you won't get bullied for sharing it.

But for some reason here they don't even have a rule talking about K-pop in general. Why?