I think such quality collapse is evident across many industries today. It might be related to wage stagnation. Can't afford to buy quality, and no incentive to produce it.
Could it be related to MBA thinking? Seems like today's corporate leadership shamelessly focuses on nothing but short term financial numbers.
Airplanes and medical software is much more reliable (though both have major problems)
Apple has no need to increase their quality: their customers are loyal at the current levels. Their customers will say it is because the competition is worse overall (the truth of this statement is different debate).
I've heard of a bunch of companies cutting QA staff in the past year or so. Upper management sees them as an obstacle to shipping and middle management sees them as the "source of all the bugs" and an entire office not "producing" anything so they're clearly not useful.