How about this: sell the browser to the entreprise [1] and use the profit to offer the browser to the public for free, which in turns helps you secure a user base.
You raise an interesting point. Every job that I worked in the last 10 years offers "real" Google Chrome on a Windows PC. I never considered that they would pay Google for it, but I guess Google could add a bunch of nice admin and security features that would be useful to mega-corps but retail normies don't care about. That is probably well-worth the 6 USD per month per user. In a modern corporate workplace, a huge amount of your day is spent using web apps... running in Google Chrome (or Electron!). It like a WebVM that runs inside of Microsoft Windows (from the perspective of corporate IT folks).
[1] https://www.island.io/