The parent and great-grandparent haven't proposed seizing private property, they're just noticing and drawing attention to waste. The observation is that if we could align incentives such that Bing, Google, OSM, Apple, etc were all investing aggressively into the same map data then everyone would be better off.

Maybe we can't! Capitalism is pretty damn good at some problems, optimal even. But it's not flawless, and it is worth noticing and thinking about places where gains appear to be possible.