The International 2019 is Dota 2's biggest event of the year, this time held in Shanghai, China. Either as a sign of respect or mandatory code of conduct, Valve are censoring certain phrases such as Winnie the Pooh and Tiananmen Square.
Valve, and by extension Dota 2, usually doesn't deal with political topics but they may have been thrown into one due to the game's biggest tournament of the year being held in Shanghai, China.
Namely, fans were attempting to have fun by trolling The International 2019 broadcast on Twitch. They were met with unexpected results as writing Winnie Pooh or Tiananmen Square resulted in temporary bans but so far it seems like no one tested the censorship further in order to see how severe the penalties can get.
While Tiananmen Square is a touchy topic for obvious reasons, some people may still be confused by Winnie Pooh censorship.
This actually stems from the character being widely used to mock Xi Jinping, the president of China. It originated from a of Jinping walking with Barack Obama where someone pointed out they look like Tigger and Winnie Pooh in a of their own.
While some fans may be worried about Valve's involvement in the censorship, one pointed out that it may not be the company's fault. Not directly at least.
The decision to what is censored and what is not ultimately falls to the mods of the Twitch channel, who may be Perfect World's employees. PW is Valve's Chinese partner who may or may not have had the final say in the matter.