My good friend Howl,
NSFW's definition stands for Not Safe For Work. This means anything too suggestive (Aka, a picture of some woman wearing a bikini).
Assume anything in the least bit of sexuality is NSFW, and not allowed in most servers and this comment section..
As for Bluey being weak, I disagree, he has just made some minor decisions that harmed his status. As for Jesper and Jurgen, they are strong enough to know you are a pain in everyone's side, and therefore; they banned you.