Just to be clear tolgus people don't get banned for taking stuff out of chest in a public area like mob farm its for the public.
but its a polite thing to not take it since other players works hard to get those items especially if the player is still busy there, rather wait your turn to use the farm, don't just take it or ask if the person wants it. I was a bit angry not to much just a little but its over it was shorted out, and I still think you are a good person.
You have been spamming a lot like panda said that is way you got banned, since staff asked you so many times to stop spamming then you will try to test staff by ignoring them and keep on spamming.