Assuming you mean left on red in the UK? 

The problem with Iron Fist isn’t “white guy who knows kung fu.” It’s “white guy shows up in magical asian land, where everyone does martial arts and is thousands of years old, and he just happens to be better at it than anyone else there.”

Licensing. If just one of the creators of one of the many properties in the game gave a limited-time license, then they have to pull the game or issue a patch to remove content.