That they chose to toe the party line on their own, without prompting from the Chinese government, with swift and overwhelming penalties on the player and shoutcasters doesn't exactly speak well for Blizzard.
If I demonstrate to you that I'm going to shoot your legs if you don't tell me I'm pretty by doing so to people around you, and then I walk up to you and you tell me I'm pretty, would it be accurate to say you chose to tell me I'm pretty all on your own, totally unprompted? Can I say that you chose on your own merely for a potential future in walking? Hey, you won't be killed by the loss of your legs.
Why would China treat the (comparatively huge and influential) NBA one way, and (comparatively tiny) Blizzard another?
Activision Blizzard is in no risk of going bankrupt even if they lose the entire Chinese market.
The situation is entirely driven by Blizzard, for fear of their potential revenue stream out of China.
This is in contrast to the NBA scenario, where China did speak out against the NBA, and later began to cancel contracts.