I think people are implying that Google told Mozilla to drop Servo, to make sure Firefox wouldn't leapfrog Chrome. And since Google funds Mozilla almost entirely, Mozilla had to comply.
Almost no technical aspect of Firefox have anything to do with how much money Google pays them.
Mozilla is basically paid by Google to have a multi-platform non-Blink browser around they can point to when accused of being a monopoly.
Having a quality browser is not required, merely it existing. So why waste money on novel web engine experiments when you can have AI conferences in Zambia?
That's my point... The fewer people use Firefox, the less money they get from Google. If you follow the money, it doesn't make sense for them to neglect Firefox.
I can't believe how this is common knowledge, this arrangement between Google and Mozilla as a weak and incompetent "competitor" propped up to avoid being accused of monopoly and anti-competitive practice. Why isn't it considered a form of fraud, not even with extra steps - a direct relationship. Maybe there's enough plausible deniability that it's hard to prove criminal intent.
In the browser space, what Apple is doing is awfully manipulative of the market too. It's almost like this situation is being willfully ignored and effectively encouraged by regulators.