Chrome (and control over Chromium) go to a newly formed, independent nonprofit. The nonprofit is not in any way under Google's control.
Google receives zero compensation. The nonprofit is funded by Google at say $250M/year for 20 years... by which I mean Google writes checks and gets absolutely nothing in exchange. The funding is conditional only on the nonprofit doing something that can be vaguely viewed as shipping a browser. Don't like that? Shoulda thought about it before you started getting all monopolistic.
The nonprofit is required to spend all its incoming funds, and forbidden to do anything but provide a browser. Just the browser. No services. All elements of the browser are AGPL. The nonprofit is forbidden to accept any offer that would put it under the control of any other entity. Every Chrome/Chromium user can become a member of the noprofit and then vote for the board. The board may not recommend its own candidates.
The browser isn't allowed to have a default search engine, LLM, "safe sites list", sync server, or whatever. In fact, it's not even allowed to provide a list to choose from. The user has to find them.
No, I don't know if that's feasible under applicable law, and honestly I doubt it is. But it'd be the right direction to go.