Valve's Free to Play Dota 2 documentary available now - GameSpot

After being in production for a number of years, Valve's "Free to Play" Dota 2 documentary is now available on Steam, and iTunes.
Dota 2 features the characters and factions from the original Defense of the Ancients title with new features.

Dota 2 will be free to play - GameSpot

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Steam (service) - Wikipedia

Valve's Free To Play documentary gets a release date - GameSpot

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DOTA 2 Players Surpass World of Warcraft Subscribers, Reaches 7.86 Million - IBTimes India

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Fortnite: Save the World won't be free-to-play in 2018 after all, but these updates sound nice

Free to Play on Steam