You are right. Also, it's not just data from the US, it's data from around the world. It also comes in real-time or near real-time, so you gain insight into where drones are actively flying. If you've managed to fingerprint interesting users in some way, you now have stats on where they are, what they are deeming interesting to look at, and so on. You're also getting much better imagery and views of things you are not going to get from a satellite.

This is not about recreating google maps data. The US banning DJI drones is really a necessity at this point. It's not a complete solution to the problems at hand, but there is no point in supporting China in this way.