[flanked-evergl]

Google's share of my attention is negligible to the point of barely existing when compared to HN, X, YouTube(yes I know, but I see no adds because I have premium), podcasts, audiobooks and many other things. Even Facebook probably takes more attention and I barely use it.

[pclmulqdq]

Google measures its share of your attention different than you do. You seem to think this is "attention paid to Google ads" but it's "attention paid to Google platforms," which correlates to their ability to target an ad directly to you. You see Google ads in many places around the web (even if you have an ad blocker), and their ability to serve you a good ad depends on how much attention you give to Google platforms, not just to Google's obvious ads. Google ads are 30% of ads on the web, not including the ads on its own platforms (search and youtube).