Discovery aimed to provide a better platform to explore and discover new streamers on Twitch.
The decision has been made. Discovery is currently offline. Thanks for all the good times.
A lot of the goals with finding new streamers have been adapted into Twitch proper, including machine learning based recommendations. The new tagging system allows more fine grained control to find those niche viewers.
If you wish to see how things worked, or create your own version, please check out the twitch_discovery repo.