You need to slap in a new ECU when you can't start your car because of a remote shut fit event. Replacing the ecu is just the easiest way to bypass the bits that are preventing the engine from starting and running normally.
Discussion
All of you just caused me to sell my cars and buy a tricycle.
I hope you took the Fiat and bought BTC. Or just sold them for BTC directly.
Was it an e-tricycle? They can remote disable those if they dont want you to leave home and they can also shut off your power. What you need is a wood fired locomotive and good 'ol steel rail