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They oppose it on paper, largely because the EPA would light their ass up if they openly admitted "we make it easy for enthusiasts to modify stuff outside of EPA approved parameters."
The first company to actually go after enthusiasts tuning their cars would lose a whole generation of enthusiast sales.
If they actually wanted you out of the ECU they would make it happen (see: many early 2000s Toyota ECUs which were uncrackable and not fooled by most inline or piggyback mods). The twins ECU doesn't have, to my knowledge, any encryption or authentication measures designed to deter "unauthorized" access. Everything's done with a standard J2534 interface as I understand it. You could read the SAE spec and write your own software to interface with it if you wanted.
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