Google Sign Up – This phone number has been used too many times (support.google.com)

> You don't need a mobile phone, you can use a friend's phone, or use a landline. Just be sure to remove that number from the account settings, once you have established the account.

Does Google not understand that there's a finite number of phone numbers and that they get reused? Or do they just not care?

This is one reason why the Burner app exists.