When Dieselgate was happening, my understanding is that you were offered a couple of options.
One was to sell back the car. The other was to keep the car, do the fix, and accept an extra 10(?) years of fairly comprehensive warranty. It transferred ownership, which made them fairly attractive as a used car, which is why I have one.
Has saved me literal thousands at this point, but after owning it a couple of years, I understand why everybody was happy to sell them back. They're junk, and the dealership experience leaves something to be desired too.
Some of these warranty claims have had me running back and forth to the dealership. My record is 7 trips before they got it right.
Another dealership left it spraying fuel all over the engine bay. That was a good time.
Imagine if the warranty was a federal minimum 300k miles/20 years. I bet they would design the components so the labor time is zero to replace them.