Xiaomi's CEO, Lei Jun, reportedly estimated that his OEM's global operations represented 50% or more of its total revenue at this stage. Speaking at an innovation conference in China, the executive attributed this international success to MIUI. This Android skin started out as a custom ROM, but now exists as multilingual official software found on millions of devices worldwide.
https://www.notebookcheck.net/Xiaomi-s-international-business-may-account-for-over-half-of-its-revenue-and-it-s-all-thanks-to-MIUI.494817.0.html