This suit [1] specifically is about users, not advertisers. It was brought in 2020.

There is a separate suit [2] that is specifically about advertisers, not users. It was brought last year.

You assert that only the second one is an interesting question. I'd say they both are. Contrary to your statement, search users are absolutely Google's customers. But a company can have more than one set of customers.

[1] https://en.wikipedia.org/wiki/United_States_v._Google_LLC_(2...

[2] https://en.wikipedia.org/wiki/United_States_v._Google_LLC_(2...