In all cases that I'm aware of including the definition of the word, a model is supposed to be a representation of something. It may be an aesthetic ideal, or cosmetically identical while being non-functional or in the case of model aircraft, partially functional but shrunk down in size.
In what way is a quadcopter(We all know that's what is being referred to) a 'model' of anything? As far as I can tell, pretty much all commercially available 'drones' are a complete and finished product that does everything that it's designed to do. The only way they could be classed as 'models' is in cases like the Millennium Falcon quadcopter, where it clearly is a partially functional representation of something else.