What do you mean appleid is illegal?

This situation means that the user has violated relevant laws and regulations, or involves sensitive information and privacy.

If the short message sent by the user contains inappropriate content, such as slander, malicious attack, pornography, etc. , or send text messages involving sensitive information such as privacy and trade secrets, it will violate laws and regulations. If the user's appleid is stolen or used to send bad information such as telecom fraud, it will also lead to receiving illegal short messages. In this case, users should take timely measures, such as changing their passwords and contacting Apple Customer Service, to protect their account security.