It’s not a ban, it’s a delay to having accounts.
From 10 December 2025, age-restricted social media platforms will have to take reasonable steps to prevent Australians under the age of 16 from creating or keeping an account.
Online Safety (Age‑Restricted Social Media Platforms) Rules 2025
Federal Register of Legislation
https://www.legislation.gov.au/F2025L00889/latest/text
Part 2—Age‑restricted social media platforms
Classes of services that are not age‑restricted social media platforms
(1) For the purposes of paragraph 63C(6)(b) of the Act, electronic services in each of the following classes are specified:
(a) services that have the sole or primary purpose of enabling end‑users to communicate by means of messaging, email, voice calling or video calling;
(b) services that have the sole or primary purpose of enabling end‑users to play online games with other end‑users;
(c) services that have the sole or primary purpose of enabling end‑users to share information (such as reviews, technical support or advice) about products or services;
(d) services that have the sole or primary purpose of enabling end‑users to engage in professional networking or professional development;
(e) services that have the sole or primary purpose of supporting the education of end‑users;
(f) services that have the sole or primary purpose of supporting the health of end‑users;
(g) services that have a significant purpose of facilitating communication between educational institutions and students or students’ families;
(h) services that have a significant purpose of facilitating communication between providers of health care and people using those providers’ services.
(2) In determining whether a service is in any of the classes set out in subsection (1), disregard any of the following purposes:
(a) the provision of advertising material on the service;
(b) the generation of revenue from the provision of advertising material on the service.