I have seen several vehicles around the Cincinnati/Northern Kentucky area advertising various drone photography businesses, each listing the various services they offer, and to date, none seemed to have suffered for it. I have to add, none of them are stocked with drones unless on an assignment. But then, it would be silly to carry a bunch of expensive drones around...., just in case!
It is important to advertise and placing an advertisement on your vehicle is a cheap way to get noticed. I like your decal.