I understand from that source that the legislation "mandates that any site accessible in the UK - including social media, search engines, music sites, and adult content providers - enforce age checks"; all accessible sites that could contain """harmful content""" (so basically a dramatically high amount of sites of importance - with particular regard to search engines, which link to the controversial).
Now: how will, say, a search engine conduct age verification without identifying the user.
Because the issue here is that of anonimity online (i.e., the disappearance of the "online" - the end of the Web).
> That’s one outcome for one set of sites
We understand from the article that the set, as said, includes the basics...