I get what you mean, but it still locks you into Apple's devices. Also, Amazon is able to produce content without DRM. Mp3 format music, etc.
I'm not sure I see your point
Apple music = Amazon music = DRM free
Apple iBooks = Amazon Kindle books = incl DRM
Apple movies = Netflix = everyone else = incl DRM
Correct.
Apple iBooks = Amazon Kindle books = incl DRM
Apple movies = Netflix = everyone else = incl DRM
Less correct. Kindle and Netflix have DRM, but they don't have the platform lock-in of iBooks and movies. iBooks, as far as I know, is only available on iOS. DRM is bad, but DRM that's tied to a smaller range of platforms is even worse.
2) Amazon's VOD service provides DRMed video, too.
Then what's the issue?
That's the problem. The DRM locks it to Apple only software and/or hardware.
So yeah, the DRM is still there, but if you're not happy with the way Samsung is doing things, you can hop to LG or Sony just as easily.
Compare with Apple where if you bought video content on iTunes and don't like the AppleTV... well... tough.