But by this point, Google has dropped billions of dollars on salaries for those developers to build Chrome (call it >500 devs, >$200k salaries, >10 years). Google is not a charity. They didn't build Chrome with the intent to lose money on it. Everything else Google made that wasn't profitable is gone now, and yet here Chrome stands. Because it is an indirect profit center.
And you've pointed out the real issue: Chrome was about freeing the world of a truly terrible web browser. 'Was'. But it did that! So what is it about now? Why would Google continue to pour money into it if they didn't expect to extract more money out of it in the future?
You can make the world better and make money while doing it. Ideally, that's what we all are doing.
Chrome is about establishing more control over the web to further the business objectives of Google and Alphabet.
The problem with this belief of Google as some kind of 'benevolent actor' is a function of the new kind of branding they helped introduce, something that an entire generation of particularly young people are being duped by.
'Brand' used to be the image that companies presented - it was a decision, a marketing tactic, usually invented by agencies. Google was one of the first to change that, to effectively 'internalize' the brand so that they (staff, even leaders) really kind of believed their own kool-aid. There's an incredible aura of 'authenticity' to this; when leaders really believe their own schtick, it rings more powerfully. (This is an issue for another thread.)
But Google has proven that in the long run, they're just a regular company. I don't think they are bad actors, and in the big picture, they're better than most. But, they're just a self-interested entity: they will do whatever is in their power and which is also legal, to leverage their incumbency and stymie competition.
You put 'benevolent actor' in quotes as if the comment you are replying to contained that. It didn't.
I see a lot of that here, people misunderstanding basic speech/writing conventions. Maybe giving the op the benefit of doubt, assuming s/he knows what s/he is doing, can help avoid some of those.
EDIT I just wanted to point out that a load of people have poured their lives into making Google Chrome the amazing bit of software that it is and suggesting that the end-goal has been entirely about supplying ads does a great disservice to their personal contributions.