I'm not sure that translates to full support for any random twitter user to be doing 'live' broadcasts. It may not be a huge impact on the infrastructure, but when cost-cutting comes up again, unless they're monetizing it somehow, I'd expect "random joe live-video broadcasting" to be on the chopping block.
MLB? NFL? NBA? I'm sure money's being exchanged to make it worthwhile to handle that.
MLB? NFL? NBA? I'm sure money's being exchanged to make it worthwhile to handle that.