I had previously got a similar impression from the eSafety Commissioner’s publication of those lists of platforms, but it does not seem to be the case they are actually defining regulation there. The lists seem to be, essentially, only statements of intent about which platforms that eSafety will seek enforcement of compliance on.

See here: …gov.au/…/which-platforms-are-age-restricted

eSafety does not have a formal role in declaring which services are age-restricted social media platforms. In the absence of any rules made by the Minister of Communications specifying a service is either an age-restricted social media platform or not an age-restricted social media platform, any determination that a service is or is not an age-restricted social media platform is a matter for the court.