Sad fact is, they're not really under any obligation to inform anyone they whack with the ban-hammer why they did so.
I mean, I was banned from the forum of a game I used to play - I was never informed why, but its more than fair to assume it was because I had the audacity to criticize the CM for producing, over a period of eight years, poor quality and badly written, blogs full of spelling mistakes and incorrect dates (as said CM would copy-paste text from older blogs but fail to amend the dates) and url links that didn't work. I guess it also didn't help that I said he didn't deserve the promotion he received too, since it was a clear-cut case of failing upwards. I did at least neglect to comment on how easily offended he was during the Livestreams he did, and how sarcastic and insulting he responses often were - but eitherway, said criticism earned me a permaban on that game's forum.