Nothing stopped NASA from doing what SpaceX did. Or New York City. Its not like they started with billions and billions. In fact, many claims that it was all funded by the government. Well, why didn't they just built it themselves?
The tortoise lays on its back, its belly baking in the hot sun, beating its legs trying to turn itself over, but it can't. Not without your help. But you're not helping.
Tesla produce a lot of for the EU in China. They have a schedule where for each quarter, months 1, 2 and 3, in Month 1, they produce cars. In Month 2 they sail them over from China. And in Month 3, they arrive and are sold.
BMW managed to overtake Tesla in the first month of Q3, barely. When Tesla really had no cars for sale.