Building an ecosystem of services and checkout experiences is not an incredibly hard problem for a company like Coinbase to solve. The reason why Coinbase (and other Bitcoin wallet apps popular in China) aren't aggressively cloning the Ali/WeChat Pay experience is probably because a majority of their userbases hold Bitcoin for investment and speculation — not to make day to day payments. These wallets and exchanges are better off spending a majority of their time building for these investors / speculators.