The only downside for starting new account was he cant post images and post interval is long compared to his account limits when he is a senior rank.
I feel you didn't get my post. With creating a new account, the banned user would break the forum rules one more time.
Read the rule number 25.
25. Ban evasion (using or creating accounts while one of your accounts is banned) is not allowed.[e]
But, now I was intrigued about this case. The user is normally only banned permanently if he repeats his mistake, or am I mistaken?
Making a plagiarized post once is enough for getting banned.