I have seen some convincing arguments that this sort of deliberate bonding is dangerous. Shouting "Cult!" is not one of them.

Separately, the link you've provided doesn't support the claim that we are a cult. I think you're trying to draw support from UC Berkeley's list of 19 characteristics on that page and claiming we have the Guilt and Fear characteristic. I think we've also got Intense Study and arguably Striving for the Unreachable. Three out of nineteen doesn't seem worrying. The page also has several independent lists of cult characteristics which do not include group confession.