I think that's technically 100% possible, the reason Tesla doesn't have such kind of thing in their cars, is because of a marketing decision. Just think about it, how the idea of Tesla being able to control and stop any of their cars remotely would scare off a potential buyer. People are so stuck into their old value system, they cannot easily get accustomed to the idea their car getting remotely controlled by a third party at an arbitrary time.
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I think that's technically 100% possible, the reason Tesla doesn't have such kind of thing in their cars, is because of a marketing decision. Just think about it, how the idea of Tesla being able to control and stop any of their cars remotely would scare off a potential buyer. People are so stuck into their old value system, they cannot easily get accustomed to the idea their car getting remotely controlled by a third party at an arbitrary time.