The design is open which means that GM or Ford can build their own adapters and their own chargers. The deal is for access to Tesla's supercharger network. Th

The design is open which means that GM or Ford can build their own adapters and their own chargers. The deal is for access to Tesla's supercharger network. The superchargers cost money to produce, install and maintain. The land on which they are installed costs money to lease. Tesla installed, in US, over 12 thousand chargers and the rumored cost of a supercharger is about $50k. That's $600 million, not counting the land and other costs. Those chargers are Tesla's property. It would be preposterous for government to meddle in a business deal where Tesla sells access to their property to others. Ford and GM are free to build their own supercharger network but I'm guessing that they would rather pay Tesla than spend $600 million and 10 years to build something that is only as good as what Tesla has today.