> they have a strong incentive to do otherwise in the future.

The reality is far worse than that. Remember FBI vs Apple? That defense came down to Apple not having software in place that could facilitate the demand being made of them. If they'd had such a system they would presumably have been required to comply.

The government can presumably get an illegal app forcibly removed from an app store but at present you could still install it yourself. With this system they could compel Google to block it entirely.