I can understand if someone takes a tractor, car, truck etc and modifies it to increase the performance and then denying warranty. Its an entire different thing to make it illegal. What they are after is the aftermarket companies that are in the business of making chips, tuners etc. Chrysler made a big change in the computers on their cars and 2011. A lot of people were ticked off because the tuners had trouble for a couple of years "cracking the codes" for these new computers. Of course its was just a matter of time before they broke the codes and made tuners available. I think this is the kind of thing they are trying to put a stop to.
Many auto makers (if not all) have done this every year or few years for a long time. Dodge diesels, and maybe gasolines, through most of the 04+ models, they changed enough with each calibration update that the tunes had to be updated to work. So every couple of months all of the tuners on the shelves became obsolete, requiring an immediate update upon purchase. And if you bought one right after dodge released a new calibration, you had a shiny new paperweight for a month or two until the aftermarket company could catch up.
Gm went so far on the duramax as to completely redesign the computer with each engine revision. So not only did they have to crack new software code, but had to figure out how to talk to it to begin with.
Allot of this, at least in the diesel industry, came as a result of deleting the emissions systems. And for sake of warranty, to prevent the horsepower increase. The 6.4 power stroke, according to advertised numbers, with dpf delete and tuning will allow you to double the factory horsepower. Obviously as a result, lots of things break.
I agree that they should safeguard their products while under warranty. But this is already more or less taken care of. Sure there are incidences where people have snuck something past them under warranty, but such is the case with any industry. There's always some bad apples.
But to make it illegal after warranty is up is ridiculous to me. It doesn't belong to them any more. They have been paid for their product. When I buy a truck, I don't sign a rental agreement. To compare it to the music piracy debacle: No one is giving away cloned copies of car pcm's, offering it for download. All people are doing is modifying it to their personal taste. It would be like me buying a music cd and drawing on it with a sharpie. Who cares, it's mine, I paid for it