Asking a rhetorical and irritating question - but one which web nerds need to be much better at answering: why, exactly does it matter? Don't get me wrong, I'm totally uncomfortable with a monopoly of this scale; I'm a Firefox user, a Pihole user, a non-FB user. But when people (non nerds) ask me why, it's hard to answer. They're all happy enough: Chrome is fast, AMP is faster, they get to find out the stuff they wan…
When one entity controls the web and you run a web based business, then you have to live in constant fear that they will destroy it. By accident or by malice.
One example how this is already happening is AMP. Google says "Give us your content or we will send people interested in it to your competitors instead". And they get away with it.