https://www.gamespot.com/articles/starcraft-2-will-soon-be-free-to-play/1100-6454641/

Despite launching seven years go, StarCraft II remains one of Blizzard's most popular and successful titles, and those who have yet to play or have since fallen out will soon be able to jump in at no cost at all. During the BlizzCon opening ceremony today, Blizzard announced that the real-time strategy game is going free-to-play.

Beginning November 14, PC players will be able to play through the entirety of StarCraft II's Wings of Liberty campaign for free. Blizzard will also offer access to the full ranked ladder to all players, while co-op mode will give free players access to every commander up to level 5.