First of all, you need is supreme rank, and after that, you need to contact staff for it. If someone is banned for scamming, then you won't be going to get that name, and tbh why does someone want to use a banned scammer name anyway
But yeah, if an account is inactive for six months+, then staff will allot you that name.... and on banned accounts, it depends on the staff team and ban reason if that name will get assigned to you or not.
So confirm from staff first. But anyways, go for supreme rank. It's worth it to use upgraded tools that are supreme only and other selling perks in the marketplace.