Tesla have service center in a lot of countries so if you’ve bought Tesla car and broken it or want to make some modifications you can request them for help. Tesla really provided interesting system so that only the person who bought the car can use all the possibilities of the car or some functions are being blocked. This is the polity of their company and you must be informed about them while buying Tesla car. What do you mean when you talk about car with open sourcing automobile technology? As far as I know when you buy any other car (not Tesla) you can make any modifications you want using your money. A lot of my friends that bought cars completely disassembled them and changed a lot of details.