One last bit I'd like to add: When trying out test streams for yourself, make note of any issues/workarounds and include them in your 'streamer friendly' instructions when asking streamers to do their thing.
Also include a clear unambiguous 'free use' content license so that there's no issues.
Here's a dev that has a dedicated page with streaming/recording permission.
Streaming & Let’s Play Permissions With the issue of legal threats being leveled at YouTube and Twitch broadcasters, we want to make sure that we give everyone permission to broadcast Race the Sun. Flippfly, LLC hereby gives permission to: – Record and publish video of Race the Sun gameplay along with accompanying sounds and music. – Monetize said video with advertisements or promotions. Notes: All of the music in Race the Sun is original and is exclusive to the game. If you have any questions please feel free to Contact Us! We are happy to provide review copies of Race the Sun to the press and YouTube “Let’s Players”