https://www.techradar.com/news/valve-mistakenly-previews-its-upcoming-steamtv-streaming-service

It looks like Valve is planning upgraded livestreaming capabilities for Steam, after a new service at the Steam.tv domain briefly went live over the weekend. Before it got pulled, the feed was showing a livestream of Dota 2 at the Valve's esports tournament for the game, The International 2018.

Valve later admitted to CNET that the feed went live earlier than it was supposed to: "We are working on updating Steam Broadcasting for the Main Event of The International, Dota 2's annual tournament," a representative said. "What people saw was a test feed that was inadvertently made public."