All over Europe amd Northern-America traditional cab drivers feel threatened by Uber and act agressively: Even cab drivers can clash. See this video about Amsterdam.
I cannot express my sympathy with taxi drivers because there is none on my side. In the same way I could protest against foreign teachers of English who come to Poland from all over the world to teach the language here. But I don`t. I rejected communism and chose capitalism many years ago and I have been consequently loyal to free market rules since then.