May I ask what this would make easier for <kids?

I can think of clubs scannings IDs, but scanners only store identification details for some period of time, until they're deleted, and not compared against a database. [0] A spoofable/transferable QR code could contain all the information normally scanned on a license plus information unique to each code refresh.

I'd love to hear what the other implications of this could be if I'm missing something.

[0] https://www.liquorandgaming.nsw.gov.au/operating-a-business/...