By the way do we have any data that newbie are the ones who do Plagiarism or higher members of the forum also do the same mistake also ?
Members of all ranks have been banned in the past due to plagiarism issues. It's not a problem exclusive to newbies. However, those who have been here long enough are expected to know how things work, so they can't claim they never heard that copy-pasting is bad. New users might not know how serious of an issue it really is and that's why the notifications are supposed to be targeted towards them.
I mean, it really wouldn't hurt to display a small modal with links concerning the rules and plagiarism after a user just created a new account.
I have been on other non-crypto related forums where you were redirected to the rules after registering an account. There was a countdown of 10-20 or more seconds where you had to stay on the page before you could close it and confirm that you read the rules. You cant force anyone to read what is written, but it's still a nice initiative.