I would catapult my Fiat into their headquarters before I paid $500 to fix something that shouldn't have broken in the first place, especially since you didn't try something unreasonable. There should be a warning in big red letters if connecting a typical OBD2 reader to it will cause it to brick. Heck, there should be an orange cap with a warning imprinted on it.
That said, I assume EV comm protocols to progress like all emerging tech, which is to say that they will initially have proprietary protocols until clear winners and standards emerge. Even then, you will likely have some weirdo manufacturers that refuse to utilize industry accepted standards. I'm thinking of the Apple car here. They will invent their own stuff instead of utilizing USB so they can make another fortune in the accessory market. We'll all run out and buy the Apple car, because a single button is sexy and within our technical ability to operate.
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