Here in Chicago the GND policy is a GBC (Graduate Business Council) decision which is voted every year (actually is voted if it is to be voted), and every year only 4 or 5 students want to review the policy.
https://student.chicagobooth.edu/group/gbc/gnd.htmSo it is a Students Code, and as you can see only for other academic institutions we are "allowed" to disclose as stated in point 7. In my internship interviews nobody asked about my GPA as recruiters know before hand that we have this policy here, and if they had asked I would have answered that I could tell him/her but I would need to kill him/her

. Well I wouldn't disclose it as I feel that I would be going against a code that was made to help us.
I like the GND here because I can go to advanced classes knowing that I may not get A+ but learn new things. Also I felt that it really helped to create a friendly environment with people actually helping one another - at least with the people I have been in touch.
I don't think that this is the only way to go, but I prefer as I want to take some risks, as an example I'm planning to take 4 courses again next quarter, and 3 of them are EXTREMELY intense - 1 in finance and 2 in economics, I also want to take 2 PhD level classes next year. In my view the GND policy assures people that they won't be penalized to take risks. On the other hand there are free riders; nevertheless they may at some point at their lives suffer the consequences of their attitudes.