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Firefox and Safari generate tons of money for Google via search referrals so Chrome would have billions in revenue if it was valued the same way.

Indeed, when you value Chrome's market share in terms of traffic acquisition, it's pretty straightforward. Especially since they designed it from the ground up to do more searches.

I believe it indirectly makes money as being a platform for Google's ecosystem, especially for their Enterprise Cloud apps suite or even Chromebooks.

Chrome is an advert delivery mechanism, if you see it from that perspective it looks highly lucrative.