In September 2022 private data for around 9 million Optus users was stolen [news.com.au]. In response, the CEO of Optus Australia has offered an emotional apology [news.com.au] after customers raged about the hack online. A statement from Optus said that Information which may have been exposed includes customers’ names, dates of birth, phone numbers, email addresses, and, for a subset of customers, addresses, ID document numbers such as driver’s licence or passport numbers. It is thought that 2.8 million people had all of their details taken, while information for around 7 million people which included DOB, email address, and phone numbers was stolen. Optus is "very sorry" and knows that "customers will be concerned". Optus has said its services were not affected in the breach and remain safe to use, with messages and voice calls not compromised.
Nothing to worry about. Just another online day in Australia.