Chrome consistently pushes to make it easier for websites to track you -- by being the slowest browser to incorporate privacy protections like third-party cookie isolation, by eliminating extension APIs used by ad/tracker blockers, and by adding new features which expose more fingerprinting surface to websites. This disproportionately benefits Google because Google runs some of the largest web tracking networks (reCaptcha, Google Analytics, AdSense, etc). Even if Chrome was separate from Google, Google (along with other ad companies) could probably keep paying them to sabotage users' privacy.

Chrome also directly uploads a lot of data to Google. It's technically possible to use Chrome without syncing your browser history to your Google account, but a surprising number of people I know mysteriously managed to turn on sync without knowing it. Other Chrome data-collection initiatives, like Core Web Vitals, also provide a lot of value to Google's other businesses. Those are other products that Google could pay directly for.