They would use photo ID the same way everyone else does. Compare the photo on the ID to the picture the person provides; which is why it needs todays date in the photo.
All that proves is that there is a person who matches the photo on their ID? It doesn’t prove it is the account owner unless the ID and personal information is stored with google ahead of time. And now you have people upset about google asking people for id to sign up, like their children for a school account and other people like me upset that my account was phished. I don’t think they even have my real birthday on my account, at least I don’t remember being required to share it.