> because there's little incentive for value chain to do so. The suppliers of car makers probably would gladly sell the components but they have to be careful

> because there's little incentive for value chain to do so. The suppliers of car makers probably would gladly sell the components but they have to be careful as their largest customer might want to grab a premium here as well. Sometimes they still sell the exact same parts under another brand name though. I believe Tesla has far fewer suppliers as other car makers so they probably also have a larger influence on the few that they have. Aren't polyswitches too sluggish for a car of electronics? Perhaps sensible for starting the motor though.