Anecdata, but I think for pre-paid services Optus never stored that information, and only used it for the required identification.
I had activated a pre-paid Optus service (in a store, using my drivers' licence as ID) but let it lapse a year ago, and allegedly my licence number was not in the breach.
I had a prepaid Optus number too. I let it lapse years ago but I got the same email about name, number address being leaked, but not license or passport numbers.
I never used the Optus number and I have moved since then. So maybe impact is minimal. But I'm still angry.
