As I mentioned previously, linking to other subs, or even simply _talking_ about /r/StarTrek, was enough for admins to accuse /r/Star_Trek of brigading. They threatened to shut them down unless they stopped members from doing that, and so you're not allowed to do it in the sub anymore.

Whether you think that linking to other subs is brigading or not, it's clear that admins call it brigading when they want to shut down subs, yet then let continue on much larger subs dedicated to the act as long as the admins like the sub.

The "good" subreddits will get posters banned left and right, but accounts are cheap and they return.

The "bad" subreddits get banned.