That's probably not it: It was not until spring 2022 that the German Flixbus challenger Pinkbus started a non-stop connection between Munich and Zurich. At times they also cooperated with the Westbahn and offered through tickets from Vienna. That's over after less than a year.
The Vom the Austrian bus company Dr. Richard on behalf of Pinkbus serviced connection between Munich and Zurich was discontinued. The Flixbus challenger does not give any further details on the reasons. As a result, the offer of cooperation with Westbahn (train from Vienna to Munich, change to the bus to Zurich) is also history. The Pinkbus route network has thus shrunk to just one route: Berlin-Hamburg.