These are pretty informal usages, I'd be more curious if you could renew your passport using the digital driver's license.

Nope. You need id? Drivers licence or passport. Try getting by without a licence in aus? You need a "proof of age card" which is a driver's licence in every way except does not allow you to drive.

Anyone who thinks you don't need a driver's licence or equivalent proof of age card is 100% having themselves on, there is no meaningful opt out.

Or open a bank account.

You can

I spoke to a JP a couple of days ago and she said they haven't been issued with a directive to accept it as ID when notarising forms so she wouldn't until she had received official word.

NSW liquor store employee, we were briefed on these last week and we accept them now.

If you sell a sixpack to a 17 y.o. you thought was 18 because they gave you a fake digital licence, that's one problem. If you witness a statdec making claims about a specific person because they gave you a fake digital licence, that's a different problem.

Do you always verify them with the QR reader app? It'd be pretty easy for somebody to display fake data on their own device.