I remember finally making the switch to IE from the Netscape 4.76 series that summer after my friend asked why I didn't use IE and showed me it was better. To be fair, IE had surpassed Netscape at that point. I believe that was IE 5 or 5.5. Prior to that Netscape was better hands down but it stagnated after Netscape 4.
The car manufacturers originally offered a franchise model. Only after the franchisees had successfully set up the market did the manufacturers try to come in and eat their lunch with corporate stores. The anti-competition laws were put in place to prevent the car manufacturers from undercutting those who had built their client base for them. In the case of Tesla this issue doesn't exist because Tesla has never franchised.
A more modern example is companies like RoadRunner and @Home. They built out most of the cable modem infrastructure under contract to companies like Comcast and Time Warner who thought there was too much risk involved. Once the cable companies saw how easy it was, they refused to renew the licenses to use their lines and set up their own cable modem service. The laws in the automotive space are designed to prevent this kind of scenario.
You're thinking of the GPL if you're talking about "viral licensing." And even in that case, it's a fallacy. Linking GPL code with non-GPL code is a copyright violation. That violation doesn't necessarily have to be remedied by releasing the non-GPL code as GPL. Other remedies are possible including withdrawing the combined project and potentially paying a fine. Ultimately you can't force someone to license their own work under the GPL, as much as that gets passed around as fact.
Correct - real computers are not Turing complete. The term is misused. Real computers fall into a class of devices called Linear Bounded Automations because they have finite memory.
That said, bitcoin is an excellent payment system. It will probably replace paypal and such, put a dent in credit cards.
In its current form, there's no way any cryptocurrency replaces paypal or credit cards. The major problems: Anonymity, Lack of protection from fraud, susceptibility to loss (lose your wallet, oops.), and user unfriendliness (expecting the average Joe to deal with wallet software and bitcoin addresses is major stretch).