If four other people disagree with your pick you can get banned

If four other people are HAVING A MISERABLE TIME with your pick you can get banned.

If four other people ask you to pick something else because they are not comfortable playing with your pick and you refuse to answer, you can get banned. Especialy if you take CS away from your jungler while playing with the strategy everyone asked you not to use.

If four other people disagree with your pick ON A CONSISTENT BASIS you can get banned

If u queue as support and constantly take ur junglers role every game u will get banned.