Good. It's 10x better than any other sign on system out there. The ease of use and privacy protections are incredible. This will force the other companies to up their game or get left behind as no user in their right mind would use something else if given the choice.
Tap the Sign on with Apple button. Native dialog pops up with two sections. First section shows your name with an edit button. You can change your first and last name to whatever you want. Second section has two radio buttons, provide your real email address or provide a proxy address. Click continue. Done.