It really just smacks of greed and nothing else... selling cars has a long history of being a profitable business on its own. You don't need to steal your customers' data to turn it into another revenue stream, but it sure looks good on a financial report.
Its not only greed, its also a race to the bottom. If you're GM, you might prefer not doing that, but if your competition starts doing that, then you're at a competitive disadvantage, because they'll have more money to invest in engineers/production optimization, etc. So the logic then goes that you might as well do it first.
This is a case where you need government regulations to enforce mutual disarmament.
There are car people out there who would rather drive a fully analog car without any electronics such as ABS - though that typically means a hardcore sports car such as a Caterham.