If for no other reason than the press attention the project received. Likewise, Amazon isn't likely to actually deliver packages via drone, but it didn't stop 6

If for no other reason than the press attention the project received. Likewise, Amazon isn't likely to actually deliver packages via drone, but it didn't stop 60 Minutes from devoting a show based on the concept. A writer coined a term "Conspicuous R&D" to describe efforts like this. Auto companies have been doing it for years in the guise of "Concept Cars." From a pure engineering perspective it's not an optimal solution, but it gained a ton more attention than if it was merely a sort of small quadcopter. I wouldn't be surprised to see this company eventually move towards non-wearable drones, but this little R&D project doubled nicely as a marketing campaign.