They didn't just decide to sell it everywhere but China... Also note that the newest version of Devotion, which I assume would be the one being offered for sale, already has the offending Xinnie the Pooh reference removed.[0]
Mark my words that the next step in China's soft power game here is to have entities like GOG remove any game that has a world map where Taiwan isn't explicitly marked as a province of China - the way they've done to airlines.[1]
Look at Abominable to see the strategy being implemented in movies.[2]
[0] https://www.scmp.com/tech/apps-social/article/2187763/taiwan... [1] https://www.businessinsider.com/what-do-airlines-call-taiwan... [2] https://qz.com/1727522/chinas-illegal-south-china-sea-map-ma...