You still need to log into spotify to use any 3rd party app and none of the playback apis will work without a premium account. Apps like this one are for people with premium accounts.
I think it's early to be adding stuff like that to government mandated driving tests when these cars are only theoretically available to the ever dwindling middle class and above. Unless my circumstances change there's no chance I'll be in one for at least 10-15 years.
I wonder, how does the autopilot safety record compare to driving in similar conditions to those which AP is typically used (open highway, good weather).