Does it support HDCP? I don't see any mention of it, but not supporting it would imply that you can't play your DRM-protected iTunes streams via an Airtame adapter. (I totally agree that DRM is fundamentally a broken idea, but alas, that's the current state of affairs).
Sadly, any compliant player for HD-Content will do the same. I'd be surprised if you're more successful with netflix, but I can't test since I'm not a netflix customer. There's enough people reporting problems with netflix and not HDCP compliant setups though.
Open source players are fine, but there's still the problem of finding a streaming service that supports open-source players or even just HD content without DRM. Now, you can go and torrent all your videos you'd like to watch but some of use prefer the ease of use and the legality of using an existing streaming service.
As I said in my previous post: I think DRM is crappy and stupid, but that's how things currently are. And since there are devices that support HDCP over the air (apple tv, HP Wireless Connect, DLNA) the "ease of use" factor is given. I doubt consumers will be all-pleased if they buy an Airtame and netflix doesn't work.
(BTW: I don't think that Streaming Services just implement DRM because they think it's fun and I don't expect right holders will be enlightened any time soon)