So while I was checking out the PC Open Beta for Destiny 2, I noticed in the launcher screen a advertisement for a Twitch tv streamer.

And I started to ponder what type of traffic does this sort of advertising provide. Lucky for us they used a public short url linker which provides public stats.
Here is the URL short link stats from the day of advertising a Twitch tv streamer received.

Over 29,856 people clicked to the Twitch stream from Blizzard's Launcher.
Looking at a couple of 3rd party stat sites that track twitch channel metrics, it shows around 1,000 concurrent viewers, 900+ new followers and around 31,000 channel views for the broadcaster during the time frame.
That's pretty awesome!