WeChat is not blocked, just like a long list of US internet services not blocked in China - Amazon, NH, booking.com, ebay, uber, airbnb, expedia and many more.
That being said, Huawei and Alipay's expansion into the US has been repeatedly blocked by the US federal government [1]. By citing the same national security concerns, using such logic, Cisco and Microsoft should have long been banned in China - but they are not, both are making good $ in China.
Huawei would like to participate in "forced" partnership and open their servers to the US government in exchange US market access. But still, it's banned by national security. laughable?
That being said, Huawei and Alipay's expansion into the US has been repeatedly blocked by the US federal government [1]. By citing the same national security concerns, using such logic, Cisco and Microsoft should have long been banned in China - but they are not, both are making good $ in China.
[1] https://www.reuters.com/article/us-moneygram-intl-m-a-ant-fi...