From what I understand, on the iPhone/iPad Netflix uses the DRM built into the device. Since Android phones are built by several different manufacturers there is no uniformity in hardware DRM (and some phones don't have any at all). I imagine that it's easier to get content providers to agree to use hardware DRM than software DRM which further complicates the issue.
Also, Microsoft has licensed their DRM for Linux on embedded devices in the past.
MS has licensed their DRM, but they will not license it for use with Moonlight. From my understanding, the licensing they have done has generally for hardware (the NXP chip in the Roku box, for example).
More likely it is the content owners who have no intention of licensing the DRM for Linux.
After the original post, most of them are "yeah right on!", or +1 type posts, until about 1/6 of the way down when streamOG begins chiming in. His posts get increasingly in depth and informative on the issue as the thread continues.
AFAIK, we haven't even talked to them about it yet... this was kind of a last-minute hack for Mix11.
Silverlight is still also very heavily used for intranet apps (which is where http://www.telerik.com/ makes their money on Silverlight controls)
Browsers for mobiles (WebKit mostly) are very buggy and even have extra restrictions that desktop browsers do not. I doubt they did a better job with the engine on WP7.