"Material harm now for maybe long-term good later" has been the goal of many a soul-saver throughout history... And they tend to go down in history as the problem, not the solution.

Regarding loci of control: I've been using mapping tools built on OpenStreetMap as of late, and they're good, but they're no replacement for Google Maps. Things Google makes simple like "restaurants near me" are just fall-flat-on-your-face bad in most of the OSM clients I've seen. So I'm loathe to declare we need to kill the working thing when the alternative is worse. My preferred approach to ending a Google map monopoly would be to invest in making the alternatives better (particularly the open alternatives). Give people a better option, and we won't have to "kill" Google; the market will do it for us.