Earlier quoted context omitted.
It's literally capitalism. It's the system that Google was allowed to thrive in and become this powerful.
Power concentration is inevitable regardless of the system because in order to enforce decentralization you would need to, well, concentrate power. Our best bet is to shame those using products of unethical companies.
Unfortunately the state has dropped the ball about anti-trust, thanks to stupid economic theories from the Chicago School of Dumbfuckery. Those are the main culprits for the shit we're in.