Spatial resolutions higher than 50cm has been a thing for civilian earth observation companies for a couple of decades. There are civilian companies who even provide products with a 25 cm spatial resolution for about a decade now.

In fact, currently there is a significant research focus on coregistering products from UAVs and satellite in good part because the differences in spatial resolutions from cheap low-flying drones and satellite imagery haven't been that different, so it's now possible to get reliable feature matches.