Disregard quality control, acquire short term profits.

Possibly, though I suspect that releasing your new DRM early is a good way to have it broken by the time you actually want to protect something with it.

More likely answer: big companies tend to be lead by people who are not hands on with the product. That means decision making isn't made on the basis of actual product needs, but rather on general policy and strategy recommended by "think tanks". And at scale, the little stuff, like annoying old clients with pointless DRM, probably doesn't matter, possibly is a waste of time. It's a bit of a necessary evil to run any large organization. Anyway, these organizations are just checking off boxes of an abstract idea, probably with some bigger strategy goal in mind. You are just a flea compared to an elephant, so their attitude is "meh, deal with it".