Plagiarism destroys your reputation, the penalty is an immediate ban of the user.
That rule is applied many years ago and destroys many members or farms. It works. I don't think it should be changed to be softer.
If you join a forum, use a service, use an exchange, and don't read rules, Term of service, you are taking risk.
When you break rules, and restrictions drop on your account, you have to accept it.