There are many other smartphone app stores offering the same services as Google play store and Apple store. Some of these offer preloaded App stores that come with the phone once purchased. Xiaomi App store does not do such in-depth checks which is why a lot of malware Apps is found on the App.com. The more Apps they let in, the more compromised their store is. This is because shutting out third party Apps can greatly limit a brands scope so to speak. Unfortunately, inviting these Apps also means inviting along their baggage sometimes in the form of malware.”]
Source: https://gbhackers.com/9game-why-you-should-never-download-from-this-app-store/