What we're seeing here is symbiosis, not competition. Google empowers (overpowers) the state and the state empowers Google. It's state action that required and legitimised automated & invasive "crime detection," while requiring and legitimising underlying the underlying data collection and privacy invasion that forms a pillar of Google's ad business.
Google's lobbying and advisory efforts, and their position as a big competent partner empowers the state. When citizens lobby them to "do something" to protect children, they go to Google to borrow their power.
"Centralisation" is too zeitgeist and has the wrong connotation, but it's close. "Convergence" is probably a better term. Actual tensions between State(s), Google and say Apple are minor compared to symbiotic reinforcement.
We're seeing one small element of Google-powered policing here. The totality is likely much broader, and law enforcement is and will be very dependant on this. Apple make more (at a 100% profit margin) selling Google their defaults than they (or anyone) could possibly make competing.