On most forums, if an ordinary user writes an unauthorized personal message to the admin, he will most likely get banned.
I say this is just plain nonsense. Could you provide at least one example where this would happen? Ive participated in various forums for years and have not witnessed this ever happen. At least not in the way you describe.
Now tell me at least one user who was unbanned via a private message to the admin?
Here you go:
https://bitcointalk.org/index.php?topic=5477510.0If you dont know something, you can just ask. You dont have to act like a jerk.