It would be even cooler if Amazon also encouraged and built a "Kiosk mode" browser view of the kindle for this sort of display hacking.
Like I totally understand why they wouldn't for new Kindles, since I assume part of their ebook sales help subsidize the hardware, but if they enabled it once a device hit 5 years old or something, I don't see what they'd have to lose.
If there is a cost or liability, then most businesses will avoid doing it.
There usually has to be a clear financial benefit: businesses should make profits - they are not social services or hobbies.
Fortunately businesses contain people and people often do altruistic things for non-financial reasons.