If so I'll bet they have the codes for only some makes and years. They cannot steal any automobile.
I’d surmise that the locks are not made to resist brute-force attempts to discover their codes (as by shutting out further attempts for a significant period of time after an invalid attempt).
Convenience would possibly suggest this characteristic, so that someone else with the same frequency door-opener using it within receiving distance of yours will not deny you electronic access to your own lock. But it would be good to allow the car owner to program his own lock-out time. Even a lock-out time of 1-2 seconds would make it harder for such an e-burglar if he has to deal with millions of possible codes.