It’s really not necessary. The ignition will not transition on without a valid key being detected in the vehicle. Most thieves are low tech idiots. They steal vehicles by breaking the shift interlock and either pushing the vehicle away by hand or using another vehicle. There’s plenty examples of tow trucks being used as well. No kill switch nor ravelco will prevent that.
As far as the high tech “relay” devices that supposedly amplify the signal of nearby keys, it’s not as straight forward as it sounds. When the ignition button is pressed, the BCM activates the antennas, which send a low frequency signal within a 3 foot range to activate the key. When the passive key activates, it sends an ID code to the RTM via a high frequency signal. The RTM then networks that information over a private bus to the BCM. So it’s not like a thief can casually pass by you and obtain your fob’s signal and start your vehicle.
Even if a thief was to have access to the Ford scan tool, they still cannot steal the vehicle. When the alarm is armed, the BCM will set off the alarm if it detects any scan tool attempting to establish communication on the network. It also blocks PATS access so that keys cannot be erased or programmed. This is why if you lose both key fobs and the alarm is set, the BCM will need to be replaced in most cases.
Apparently Chrysler didn’t have the key programming restriction built into their system until recently, which makes Chargers and Challengers a popular target for thrives.
In another thread we were discussing the new network architecture that debuted on 2021+ F-150, as it is preventing some emissions equipment from communicating. To improve security against hackers, the new system uses a remote mounted OBD2 port with an Enhanced Central Gateway Module buried behind the dash. That means none of the vehicles networks can be accessed directly from the OBD2 port; all communication is through the Gateway Module.