You didn't answer my question. Should it be legal?
Swap out "car" with "any electronic device of your choice". Should Intel/AMD be legally allowed to remove the CPU firmware on a whim making your processor a worthless pile of sand? Should your phone be allowed to be bricked by software updates because the manufacturer wants you to purchase a new model? Should fucking Casio be allowed to remotely disable your F-91 W digital watch because it contains firmware you do not own?