yes.

Criticisms

MIUI's kernel was closed source, and thus in breach of Linux kernel's GPL.[12][13] Due to criticisms, source code for certain components was released to GitHub on October 25, 2013.[14][15]

Prior to V4, MIUI has been criticized for being similar to iOS.[16]

Since MIUI V4, based on Android Ice Cream Sandwich and Jelly Bean, Xiaomi added a virus scanning engine from partner company Tencent (formerly from Kingsoft, whose previous CEO was also Lei Jun) despite the opposition of many users. Methods of removing it have emerged in the MIUI China forum,[17] since the engine was proven not to be helpful.[18]

Also during the development of MIUI V4, Xiaomi started to remove Google services from their ROMs in order to build and monopolize its own environment of Xiaomi, including cloud services, paid themes and games (featured by MiCredit currency).[19] Later, during development of MIUI V5, nearly all Google services were removed due to Chinese censorship laws.[20]

Miui is owned by xiaomi tech.. What is ur question again? Missed it..