— How could Chinese go on with boosters without being penalized?
— Wang Hao was the only chinese who got penalized for using booster, back in 2015. Since then, Chinese had learned the lesson and took certain precautions for a possible racket inspection. The best effective prevention from being penalized is the voluntary safety-control on the racket.
Herewith, you can see Fan Zhedong came in for a voluntary control prior to entering the playing court.