The Chinese government likes to plan, regulate and control everything.
But the Wechat/Alipay payment systems caught the government completely off-guard, especially the way they spread so rapidly, and in the last couple of years the government has been playing catch-up, with various new rules trying to regulate the industry, like real-name verification.
The government would have much preferred that state-controlled Unionpay have a lock on the payment system, but Unionpay was too slow off the block and got caught out by Wechat/Alipay.