Will Amazon be sharing the drone video footage with 3rd parties? I realize satellites can already see back yards but they have a hard time seeing into sliding glass doors and windows whereas a drone can see all around it down to ground level. Also I don't know what type of cameras these drones have but some drones have color, FLIR and night vision.
Most of these drones have wide angle cameras for navigation and obstacle avoidance. They would need to be within a couple of feet of a window to actually see what's going on inside. If they're hovering over your yard, they'll be sufficiently high (15-20ft) such that the resolution of your window is useless.