No, it’s account based, in a lot of cases changing your DNS won’t change the server you end up with at Youtubes or whoever

Age-restricted platforms are expected to take reasonable steps to:

• find existing accounts held by under-16s, and deactivate or remove those accounts

• prevent under-16s from opening new accounts

• prevent workarounds that may allow under-16s to bypass the restrictions

• have processes to correct errors if someone is mistakenly missed by or included in the restrictions, so no one’s account is removed unfairly.

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Does every Australian now have to prove their age to use social media?

For example, if someone has had an account since Facebook started in Australia in 2006, Meta could reasonably assume they are older than 16 so no further check is needed.

https://www.esafety.gov.au/about-us/industry-regulation/social-media-age-restrictions/faqs

Platforms then use a variety of signal’s to detect if someone is under 16:

DNS has nothing to do with it