Re: So....?
If data privacy is your concern maybe don't use the Internet at all.
I'd bet you posted your comment from a major browser on either a Windows PC or Mac or from an iOS or Android device so it's a bit late for worrying about that.
Personally I'd trust Xiaomi just as much (or little) as I'd trust Samsung or Google from a privacy point of view.
The hardware is pretty good anyway, I have a Mi Mix 2S and it's very good. If using Xiaomi's OS worries you, there is a working unofficial Lineage OS for it.