More likely that the US is ahead. The GFW heavily props local companies. Chinese internet companies are much less market-tested than US companies.
If china is ahead in this, then humanity might as well pack it in. China's sandbox model works well when you've got a few hundred million uneducated peasants, but an educated populous (Which china is having more success stopping than I care to admit) wants diversity; It wants options, differing opinions, choices that cater to them, not to what people want to offer them.
It's a platform, it could certainly evolve to cater for different options.
China has an educated urban population about equivalent in size to the entire population of the US, and they're all using WeChat. My wife is a Nurse, has a 2:1 degree and although born in China has lived and worked in the UK since 2000 and she uses WeChat all the time, as do our kids. Educated non-techies don't want diversity, they want functionality and community.
Yup. My English sister has been using it because she gets better quality voice than Skype. Maybe Wechat is winning because it's the better product.
Please spellcheck "educated populous" before claiming another country doesn't have one.