without delving in the conspiratorial, Can anyone explain why would the broadcast be restricted to Apple TVs other than trying to control the number of concurrent streams they have to serve for scaling purposes ?
While I understand Apple TV is a product, and you're explaining that the service is available outside that particular product...
"anything that runs iOS >=4.2 and OS X >= 10.6" that is going to display a live video feed from another city is acting as a TV by Apple. Or, an Apple TV. In a colloquial sense, yes, this is indeed restricted to Apple TVs.
Yours? Certainly not. But I bet that thousands of less tech savvy people do refer to their devices as TVs, especially in the context of live video streaming.
Good lord, they might read it. I don't know. I was just trying to mention that Apple devices act like TVs to the regular population. That's all. I don't care if they read these comments, I care that HN users are not so constantly hiding in their bubble. It's clear to me now (via all the downvotes) that these comments are not welcome here - I'll stop. Sorry.
My guess is that they aren't artificially limiting it, they are using HLS[1] which is only supported by certain browsers/devices. Stream isn't up yet to test but it should work on a newer (4.0+) Droid as well as in VLC if you can find the stream url.