Designer Island is a programmer, development-oriented closed zone and instance for use by Blizzard employees and not accessible to players, similar to Programmer Isle.
So some guy in LFR shared a quests called Clayton's Quest: Extreme!!! with the objective off killing 255 evil squirills, since i haden't heard of the quest before i accepted too see wich quest Hub it was from.. then it said Designer island and i was like say whaaaaaaaaaaaaaaaaaat
So now i'm wondering.. will i get banned for having an not-allowed quest
Not on this character ofc
The quest however was in a GM only zone which you should not go to, that will get you banned.