Even if he complies to all the regs. There is no way people in the west will switch to his app. The reason why those all-in-one apps took off in China and Southeast Asia is because banking infrastructure sucked hard before. You could only pay cash in most places unless you went to more upscale stores. Because those payment terminals are just too expensive for many small time businesses. With the arrival of those apps even a street vendor could afford to accept digital payments. Thus lots of people started using those apps to pay. The western countries already have good banking infrastructure and people are very hesitant to switch banks.