Ladybird seems to be the only hope, once available.
If Firefox and Apple can't rein in Google with their competing engines, what exactly does Ladybird change?
Same reason some of us choose Linux over Windows.
In fact your example betrays you, because it would be like rewriting Linux from scratch while still attempting to maintain perfect compatibly with Linux. And then arguing that you've somehow weakened Linux in the process. Why not just fork it and maintain your own fork?
Straight from the source:
And how does that "ownership" look like in practice? Has Google ever decided how things should be done "or else"? What Google does is pay a protection tax. Without Firefox around and independent, the EU is almost sure to break Chrome away from Google, especially with the warm EU-US relations now. So Google pays and is going to pay as much as it takes to keep Firefox alive, kicking, and doing whatever it wants.
Google Chrome needs Firefox to be moderately successful more than Firefox needs that money. Or else it might become someone else's Chrome.
> Follow the money
Everyone has this revelation once. If it was that easy then customers would practically own the company providing them the services. Do you and your fellow paying customers feel like you own any company, especially big-tech? Do you all control Netflix? Amazon? Apple?
A million individual voices are just noise which is what your "fellow paying customers" line equates. A single monetary contributor is not that. It is the sugar daddy of Firefox. Conflating the two seems to be a bad faith comparison.
That doesn't really seem relevant these days though. Although I guess duopolies are totally fine.