There will probably never be exercise bikes in autonomous vehicles but there will definitely be social media and ads, lots and lots of ads.  Boxes on wheels with no windows, just screens displaying advertisements. Windows will be a luxury for the wealthy and car manufacturers' will have big robo-taxi fleets but their revenue will come from ads, but at least the ride will be free. You know that feeling when you leave a movie theater after a matinee showing and it feels weird that it's sunny out because you think it should be night time? That's how you'll feel every time you exit an autonomous vehicle.