Also there is a huge difference whether the information sharing is voluntary or involuntary.

(Where "involuntary" includes also stuff like: "you have a right to remain silent, but then you will burn in hell for eternity, mwahaha!" or "we are not going to pressure you into telling anything, this is just a friendly talk, am I right? but your unwillingness to cooperate could reflect negatively on your assessment report, so why don't you think about it again and then tell us your decision".)

Without pressure, sharing information in group is just sharing information on a group scale.