Please make sure you have an email address listed on your QRZ page. If you don't want anyone to know your email address, or you don't have one, list a bogus one. A very popular scam lately is for someone to pose as you, get an email address with your name or callsign, and "sell" amateur radio gear. If you do have an email address listed, someone being scammed will likely look up your QRZ page, see that your email address does not match the scammer's, and not fall for the scam. If you do not have an email address listed, that's one way the scammer looks legitimate. When the scammer is successful, your reputation could be tarnished. There is no way QRZ, or anyone else, can prevent a scammer from impersonating you. Except for you, yourself.