Possibly a greater benefit to Google is the influence it gives them over web standards.
For example, if google didn't control the most popular browser, they probably would have had to say goodbye to third party cookies a long time ago, but since they do they've been able to delay it for quite a while, at least for a considerable portion of users.
Firefox and Safari have disabled third party cookies years ago, but chromium based browsers still have them on.
And then look at Google's "privacy sandbox proposals, that aim to replace third party cookie functionality. They have largely been rejected by Mozilla and Apple, over privacy concerns.
Firefox still accepts 3rd party cookies by default. They've made some moves to reduce reliance on them. Sadly privacy zealous prefer the perfect over the good, so won't get either.
For example, if google didn't control the most popular browser, they probably would have had to say goodbye to third party cookies a long time ago, but since they do they've been able to delay it for quite a while, at least for a considerable portion of users.