Why is no asians gear listed in the wta section?

sorry i don't know where to ask.. but in the pro gallery where you can view gears (rackets/strings ect) and such.

why is players like Qiang Wang - Shuai Zhang - Chan sisters - Sai Sai Zheng - Hsieh not listed?

Naomi Osaka is listed.. but she is japanese.

does china/taiwan players not have a contract or something to list their gear publicly?