When I got my '97 Chevy K1500, I paid Audio Express $60 to remove the aftermarket alarm and ignition-fuel cutoff mess that a previous owner had installed. Only one of the two fobs that came with the pickup worked, and that particular system hadn't been made or sold in almost 20 years. I couldn't even find owner/operator information about it on the internet. That was money I consider very well spent.
PS: Those keys are all old-fashioned "dumb" keys, and I plan to keep this pickup for the rest of my life.