What is the expected outcome of a brigade?
The most common by-product is the disapprovals, deletions, bans, and apologies that are required after.
Mods allow it, and mods have to clean up after it. The only reason previous owners allowed it, is because they couldn't say anything that makes the herd unhappy- they could've had one targeted at them too.
I think it's sad when it's not funne.
A few years ago, MSmg held Page 9 parties which were a Fun stream "brigading" activity but with upvotes and cool comments.