https://www.polygon.com/2017/11/4/16607330/starcraft-2-free-to-play-details-blizzcon-2017

More than seven years after the launch of StarCraft 2: Wings of Liberty, Blizzard Entertainment is making the real-time strategy game free-to-play. The developer announced its plans to release the game and its first campaign for free at BlizzCon 2017 this week, a move that will open StarCraft 2 up to a broader audience.

Blizzard’s Tim Morten, production director on StarCraft 2, said conversations about moving to a free-to-play model have been happening for a while, but that it was important to make the change palatable to new and existing players.