We are starting to see more of this. With Axis cameras, you can output in rtmp to a streaming service (youtube, twitch) or a server distribution service (wowza, dacast) where you can develop your own service. You can also use wirecast or obs to broadcast a multi camera broadcast. i have been playing around with wirecast and rtsp streams from existing cameras. Works good. Most school ip cameras are good to go with rtsp into wirecast/obs. You can broadcast directly to youtube/twitch/facebook or other 3rd party streaming services (the cube). Wowza is pretty awesome. Lookup their extensive video training on Youtube or Telestream (wirecast). Obs Studio (gamers stream with this) is free, so you can play around with streaming secondary streams (rtsp) from existing ip cameras. I built a basement studio with green screen, lights, wireless usb microphones, and 1080 usb and ip cameras for less than 500 bucks. (does not include the computer).
Camstreamer with Axis (300 bucks) is an easy single camera streamer application if a school did not want to invest in a 3rd party distribution service. The could pass on the streaming links via their website.
http://www.nfhsnetwork.com/
We see many of our northeast highschool playoff games here. I suspect they may be using something like wowza or dacast to host this on amazon cloud.