It doesn't matter. Even if it was something else - the quoted copypasta means that you're very unlikely to get unbanned.
I think it's unfair to instaban without warning or a restricted ban for example.
Well, then follow the instructions on your ban message and attempt to appeal it. Only the administrative/moderation team can overturn your appeal. However, I wouldn't hold your breath waiting for a favorable response. In fact, I wouldn't hold your breath waiting for any response at all.
Already done, I waited 2 weeks no response I remember reading that they no longer answer ban appeal email so I decided to open this thread.