Earlier quoted context omitted.
StarCraft 2 is still competitive 14 years later. I’m not sure I’d personally have an issue with it becoming public domain but the game is still well-stewarded today. Even Brood War is still satisfactorily supported 26 years after its release. Though I think that’s definitely long enough to consider the option of public domain.
Is it the same StarCraft2 as 10 years ago, or regularly updated?
The issue here isn't so much, "Are Blizzard allowed to charge for SC2?", but "What would happen if Blizzard pulled the plug on SC2 servers?" It would very much be a shame if a game like that were suddenly ripped out of the culture.