The reason for the limitation isn't entirely arbitrary, as Apple is using a new streaming technology called HTTP Live Streaming which was introduced alongside Snow Leopard's QuickTime X and iOS 3.0.
While the protocol has been proposed as a standard, so far Apple is one of a few companies who has implemented it. As a result, the video will only be easily viewable on the specified platforms. There seem to be some advantages to the system over existing streaming technologies. Notably, there should be no router/firewall issues as the stream is sent over standard HTTP protocols.
Ehkä niillä PC:n omistajilla on ihan oikea elämä ja ovat pikkulauantaina bilettämässä? Itsekin saatan olla, mutta kuka estää minua kaivamasta esiin iPhonea ja livestreamia?
Säälittävää.