I don't see a real need for Chrome. The stuff they've done to break Adblocking makes it pretty much a dead project today. Web browser development should be open source and not for profit. There is a fair argument that it has been because of Google's funding. There's a strong argument that Chrome has existed to further Google's business and at a minimum protect it's business and ensure third parties didn't hijack all of their PPC revenue in the early days.
It is easy to foresee an outcome here where someone politically connected gets a hold of Chrome and does a lot of crap they shouldn't. The worst case outcome is unrelated to any of this, and something where we end up with government mandated garbage in a web browser. It is very possible that DRM and biometric age verification, and who the fuck knows what else thanks to AI, could be required either by the US or EU, and kill the open source web browser. That's worse than anything Google did.
Make it make sense
Selling user browser data obviously won't fly (and note that Google has never explicitly nor directly sold user's browsing data as far as I know, but they do have a huge ad network that utilises cookies...), so what's the plan? Put ads in the browser? "Premium" features?
The only thing I can think of is highjacking links to Amazon et al to insert referral codes en masse, or selling links/ads on new tab pages.
Why not sell premium features?
Why not add affiliate codes to links?
Why not sell ads on new tab pages?
All of these are fine examples of how a not-Google Chrome could make money. They could even get paid by Microsoft or some other not-Google search for that traffic.
This isn't hard unless you're trying to make it hard to convince us all we should just give up and let Google continue running our online lives through monopolization.
The details could be worked out. The idea is to make big corporations pay while keeping it free for users.
To be fair, Google could reassign them to something else. Firing everybody will be Google's decision that wasn't forced on them.