The same mod that heads the main Reddit for the game mods in the RWT subreddit, I see no difference between the two sets of creatures.
Their main “excuse” is to not be flooded with the trading posts, but obviously they could just delete them, as they do posts razing people, and other forms of spam. Circle Jerk is mostly self posters, don’t imagine for a second that’s all the spam they get, hardly anything ever gets moved to it.
TLDR They deal with other forms of spam and “rule” breaking just fine, why not RWT? IMO its because they are the RWT.