It should totally be possible, I trust without clicking that they have an impressive proof of concept. But I've never seen it implemented in a commercial product. The only purpose would be when GPS is not available (indoors? Perhaps in a cave or on a space station? Not very common scenarios to not fly on auto pilot), so it makes sense that nobody bothered.

Yeah I'd be wary releasing that commercially, drones are easy enough already to crash, giving users an automated feature with the potential for monetary loss is asking for drama and bad press.