For some people "the whole internet" is like half a dozen websites.

They mean most of the internet for most people
Only the vast socially relevant parts of the internet

Australians will soon be subjected to mandatory age checks across the internet landscape, in what has been described as a huge and unprecedented change.

Search engines are next in line for the same controversial age-assurance technology behind the teen social media ban, and other parts of the internet are likely to follow suit.

https://www.abc.net.au/news/2025-07-11/age-verification-search-engines/105516256

It's the Internet. There are internets, but just one Internet.