The Chinese do have specific channels, like online platforms there are youku, tencent, mango tv, iqiyi, and there are even more different tv channels that are separated by city, like Beijing channel, Shanghai channel etc.I always wondered about Chinese artists because there are so many of them I can't even keep track. I know they are signed to an agency but from there do they just act with any production companies because it seemed actors/actresses are all over the place. Do they even have a specific channel? Because some web dramas are pretty good. And their views are like in the billions. Though 2 billions are considered successful ( usually it's a possibility of a second season) and their industry is way more competitive. Anyway, have been curious with that side of the world when it comes to that.
Like one actress auditioned and had to act out a line 40 times with different actors.
And yes, the actors and actresses can act under different production companies.
Although Hong Kong's TVB follow a similar route as Thailand, where if you're under their channel, you can't appear in another channel unless the management gives permission.