As steampunk said AFAIK a bunch of people(retailers/oem's or consumers I don't know) smacked Nvidia with a class action suit, hence the Class action mentioned everywhere all over it.
Nvidia have paid out pretty big to several OEM's who were replacing laptops quite some time ago, they gave Sony 150mil or something and some others.
Thing is, your average laptop user doesn't have a clue who Nvidia is, and when their laptops died shortly after the warranty went kaput, they went and bought a new laptop rather than going "hey, I wonder why this died".
If people sued Nvidia in every region they'd be pretty much paying through the teeth for every failed Nvidia gpu they made for 5 years. Even though I can't stand the way Nvidia does business, I wouldn't have been arsed to bring about a class action lawsuit against them if my laptop had died, that's life.
I'd be very surprised if MANY companies didn't have similarly faulty products out there costing end users 100's of millions across the globe that just don't get specifically found out.
The Xbox issue cost them a lot more than it cost Nvidia, because MS is a much more public company, most people didn't know what the cpu, gpu or hard drive was in their Xbox, but they knew their MS Xbox failed, other peoples Xbox's were failing and MS had to be fairly public about it. When Sony laptops failed, Sony took the blame for the most part and same with the other OEM's.
If for instance it was Shield's or Tegra tablets that failed in the same way Nvidia would have taken a crapload of bad publicity and had to refund/replace stuff to the level MS had to with the Xbox, but they were fairly shielded from responsibility from most average users on this problem.