The antonym of "most whitehat" could be "most blackhat." Blackhat refers to the unethical, illegal, and malicious activities performed to breach computer systems, devices, or networks. Blackhat hacking can result in data theft, identity theft, financial loss, and other severe consequences. Some common blackhat practices include phishing scams, ransomware attacks, malware distribution, DDoS attacks, and unauthorized access. Therefore, individuals or organizations involved in blackhat activities are considered cybercriminals or hackers. In contrast, whitehat refers to ethical, legal, and beneficial activities performed to secure and improve system security. Whitehat hacking includes penetration testing, vulnerability assessment, security auditing, and other similar practices that help identify and fix security loopholes.