ACCC hasn't taken any interest in privacy for decades. The first time they showed an interest was the very same digital platforms review in 2018 that also led to them extorting Google and Facebook to hand over cash to Murdoch. We don't even have decent privacy laws, so the ACCC have been quite open about using section 18 of the consumer law as a means to enforce privacy standards against tech companies (said section is a vague prohibition on misleading or deceptive conduct, which can be interpreted as broadly as the ACCC likes which means it can be easily weaponised against whomever).
Australia has very high levels of market concentration and the ACCC is widely derided for failing to ensure competition. This is not a competent regulator. Of course one of the most concentrated industries is the media, which also hates tech companies, so the seeming alliance between the ACCC and traditional media conglomerates is of interest when considering their crusade against big-tech.
Regulatory capture is a well-known phenomenon, and it's especially dangerous when the captured regulators destroy competing industries. A recent example being the FDA's attacks on e-cigarettes because they've long been partially captured by traditional tobacco companies.
https://www.acsh.org/news/2022/05/27/study-raises-questions-...
A month after that was published btw, Matt Holman, chief of the office of science in the FDA's Center for Tobacco Products, left for Philip Morris, a competitor to Juul's owner. This is how things work, it's just harder to find out about when it comes to Australia because, again, we don't have a functioning press, thanks to the ACCC.