It's two sides to the same coin. The stuff that makes this possible is the same stuff that makes all the futuristic tech on a Tesla possible. So you could theoretically jailbreak it (Rich Rebuilds probably figured it out by now) disabling the stuff that would allow this to happen would also disable half the futuristic features on your car.
No but you (most of the time) lose the ability to get software updates which are a pretty significant feature of Teslas.
I also wouldn't be surprised if Tesla locked out your sim if they found you to be abusing it so you'd have to try to get a new one (not sure how that works with eSims).
