It's a shame that here in Germany, the railway has a state-guaranteed monopoly on long-distance ground travel (this is a law that goes back to the Nazi era!)
So, there are hardly any long-distance bus routes within Germany, only to Berlin (which was an exception from the person transport law that was made in the Cold War era), and to neighboring countries.
Of course, public transport is a complex issue - the government as the current owner of the railway system is still trying to protect some routes, so we have to wait and see how the licensing for long-distance routes is working out.
And the Deutsche Bahn (German Railways) is also the biggest provider of bus travel, so it will be quite hard for new companies to get into the market.
So, there are hardly any long-distance bus routes within Germany, only to Berlin (which was an exception from the person transport law that was made in the Cold War era), and to neighboring countries.