I'm guessing your email and some passwords were leaked recently. The scammers are hoping that you:
a) have a chatgpt account already
b) are lazy with your passwords and reuse them across services.
Or
c) will click on of the verification code links and let them in
If they get lucky, they get an openai account in your name that they can fraudulently abuse. It costs them basically nothing to try, and theyll be doing it across millions of accounts.