The games that are removed from the digital store are games that are no longer in development (they are also no longer being maintained, so they won’t work well). Their development ceases because they are unpopular and the devs went bankrupt. So if you are trying to get those games, you are getting games so unpopular the devs literally went bankrupt. To do that you would have to be a person who collects games. 50 bucks for a disk player is nothing for a collector.
Maybe the wheels, but not the parts. You’re thinking of android. I would actually embrace a car that you can build yourself, though, that seems very cool. Just not something Apple would do.
