Looks like this is a case of someone who can guess and brute force their way into your identity.
The security questions for someone who is well known, maybe even biographies about them can make it simpler to work out the security questions. Apple did have a flaw that they closed but these current hacks have been investigated and looks to be the case that most of us wouldn’t face.
- Make sure you have good passwords.
- Make sure you don’t use the same password on different websites/services.
- Set up Two Factor Authentication