I've fallen and I can't get up! Looks cool, but based on the design once it's on the ground I can't see how it could generate enough airspeed for lift to get back in the air.
I imagine a good use case could be for search and rescue in rough/inaccessible terrain. Imagine a building has collapsed trapping people inside. A flight-capable vehicle could quickly navigate to the area, and once it reaches the rubble, it can crawl in, searching for survivors.
Consider the end point of a mission; getting there is more important perhaps than getting back, especially for a drone. If everything work out, they can be retrieved manually later.