Because they punish experimentation as it eats into their bottom line. AI is a tool for ads in the mind of executives at Google. Ads and monetization of human productivity, not an agent of productivity on its own.
"Laser-focused on the bottom line at the expense of all else" is not how I'd describe Google, now or at any point in the past. They have a lot of dysfunction, but if anything that dysfunction stems from too much experimentation and autonomy at the leaf nodes of the organization. That's how they get into these crazy places where they have to pick between 5 chat apps or whatever.
If Google were as focused on ads as you seem to think we'd at least see some sort of coherent org-wide strategy instead of a complete lack of direction.
The person now in charge of Search is Elizabeth Hamon Reid, a long-time googler who came up through the ranks from engineer (in Google Maps) to VP over 20 years. She's legit.
That was a decision that prioritized the bottom line over other things. But saying that Google is "focused" on the bottom line implies that there's a pattern of them putting the bottom line first, which is simply not true if you look at Google as a whole. Search specifically, maybe, but not Alphabet.
C'mon, Google doesn't "punish" experimentation. Google X, Google Glass, Daydream, Fuschia, moonshots, the lab spinoff (whose name I can't remember)... hell, even all the abandoned products everyone here always complains about.
The experiments often/usually fail, but they do experiment.
