Chinese swimmers have a history of doping violations. Though the Chinese doping control center was instituted in the 90s, Chinese sports were already under the shadow of drug use.
The conflicts in the swimming community went beyond the personal tensions between Sun Yang and Mack Horton. Instead, it was a debate about the anti-doping ecosystem of swimming competitions.
After winning second place in the 400m freestyle at the World Aquatics Championships, Australian swimmer Mack Horton refused to share the podium with Chinese swimmer Sun Yang, which lead to furious reactions in China.