You know how its all over the news everytime a Tesla has a crash?

EVs are an unknown quantity for most people, if someone repaired their Tesla badly and something happened, all that would be reported is 'Tesla catches fire', but you wouldn't see 'petrol powered Ford catches fire'.

So I think its understandable that Tesla would want to be protective. That's not to say that I think they should be allowed to do it though. One would hope that there's an independent testing regime to check that the car is actually roadworthy.