Really?
Really?
Edit: Downvotes are fine, but a counterargument would be more welcomed. There are dozens of live streaming services out there now that support every platform available, but Apple always insists on using their own. It backfires every year as the stream is flaky or has audio/video sync issues.
If they can't bring themselves to partner with someone else, they could at least devote the resources to fixing their own broken system.
It just seems like a lose/lose situation all around, but they stubbornly persist.
The numbers I could find are 1.3 million viewers for this year's Super Bowl, 1.7 million for USA vs Germany in the FIFA World Cup, and 81.000 simultaneous viewers for the Macworld keynote, in 2002 (https://www.apple.com/pr/library/2002/01/09Apple-Delivers-Re...)
I think it is safe to bet that Apple's keynotes have a larger audience nowadays than in 2002, but how large is it? Reading http://www.scribblelive.com/press-release/record-breaking-on..., I do not rule out that it has more viewers than that Super Bowl stream, which, Google and my own experience tell me, wasn't perfect, either.
So, maybe, limiting this to Safari users is their best option.
Feel free to improve this speculative line of thought by providing data.
[0] http://www.reddit.com/r/apple/comments/2yfqyj/watch_the_appl...
If you are wondering, like I just did, why it's supported on Android but not Chrome: https://code.google.com/p/chromium/issues/detail?id=54198#c1...
Usually some people will post source links which should be streamable from non-mac machines.
The rest of the stuff in the keynotes—the stuff that makes them keynotes, rather than ads—only matters to Apple developers. And I'm not sure how you'd be an Apple developer without already being able to watch this. (Even if you only develop HTML5 webapps for iOS, that still means you've got an iOS test device.)