It was introduced by Turks living in Germany, the only dispute there is is about in which city it came first.
Turkey claims it for propaganda reasons only. Or in Chaplin's great word "Stonk!"
Anyway, I dont care, I dont eat it. The meat spears come from factories who are dubious, imo. Who knows what they put on the spears. I only know what in theory should be on it - and what not.
Its also hilariously expensive now, like a major lunch in a restaurant. I recall times when it costed 1,80. Now its 7-8 Euros, and more. For that money I already get a small Entrecote (=Ribeye in French cut), or 300gr of frozen lamb. And have no glibbery white bread and no disgustable veggies with it.
Fast food in general has become - healthy. The prices are such that less people buy them, that is good for their health.