The usage you're describing doesn't equate to success in China, you're still a customer outside of China even if they're working with businesses in China.
I'm not saying the two services you referenced do or do not do well with the Chinese market, but it's a different proposition to actually capture a massive distinct market vs expansive options for the existing customer base.
I see Agoda as a competitor to booking.com, I can see they always have a price advantage against booking.com. All these services are not pleasant to use. People normally spend quite a bit time in searching for places to stay. I wish there is more personalized service. I find it is painful to go through reviews and list of properties.
