I used to work with the USG. There was "Beta" software absolutely everywhere, including on some very sensitive systems, because it was not required to go through security approval until it was out of Beta. In some instances, these applications had been in place for > 10 years. That was a number of years ago, so I hope the situation has changed. In general, the USG doesn't have sophisticated infrastructure and policy to deal with software that is in development. With Tesla, my guess is that it is not that they are allowing it to happen, but that they lack the regulatory infrastructure to prevent it from happening.