This is all possible because China has standardized bank to bank transactions across all banks in the country. It sets the tone for secure P2P transactions at fractions of the cost of a regular Credit Card payment.
This allows people to on-board to WeChat Pay easily through online banking. They also have way less KYC hurdles, so people can go from signing up to sending money in minutes.
US online banking is eons behind China, and almost any other country. So many online banking systems in the US are prone to unauthorized access, which makes on-boarding and security highly inefficient.
It's my impression that pretty much all functional countries (e.g. perhaps not Somalia or during a civil war, but including most less developed countries) have "standardized bank to bank transactions across all banks in the country".
The big difference is how fast and cheap these standardized bank-to-bank transactions are; with USA lagging behind in this area somewhat. In USA a wire transfer is more expensive than a credit card payment, in China, EU, Russia, etc it's cheaper than a credit card payment.
This allows people to on-board to WeChat Pay easily through online banking. They also have way less KYC hurdles, so people can go from signing up to sending money in minutes.
US online banking is eons behind China, and almost any other country. So many online banking systems in the US are prone to unauthorized access, which makes on-boarding and security highly inefficient.