Not an expert by any means but streaming HQ video is pretty expensive (even more so for live content), seems like the only providers that can do so profitably are YouTube and Netflix. I'm sure a big reason for that is the engineering (esp. CDN)
This is actually not true nowadays. Streaming HQ video is pretty cheap (check out per GB pricing from Cloudfront or Fastly and divide that by 5-10 to get a realistic number)