I think it is because even if legally ok, this company only exists due to massive support from US citizens. Therefore, I think the natural expectation is that this company needs to allow for some flexibility due to this not being an exclusively Chinese venture.

Additionally, learning a language isn't just memorizing phrases but also understanding the culture and values behind it. If you don't at the very least understand the US/UK perspective on tyranny, it will be nearly impossible to comprehend a lot of 20th century English literature. "Big brother" is a relatively common phrase that I don't think is possible to explain in an entirely Chinese government sanctioned way.

I'm not sure how relevant going over these issues specifically is for teaching English, but in my experience Chinese culture is extremely different from English culture and there are almost inevitably going to many conflicts.