Not advertising 3rd party inks: fair enough. Putting stern warnings about how they may not be as high quality as your own: getting dodgy. Installing DRM chips into your ink so that you can't use 3rd party supplies at all, nor refill your own 1st party inks and sue anyone who succesfully works around this under the DMCA: definitely a dick move.

Have you not noticed the widespread uproar about the price gouging on ink supplies? Your example of what's an appropriate business move is a textbook case illustrating the opposite.

The fact that you're more pro-Apple than Gruber on this should be a sign that you're out in the left-field. You'll need better arguments than inkjet manufactures do it too and the iPhone isn't public domain if you want to be convincing. Unless your argument is that not only can corporations do whatever they want but we have to like it too.