Xiaomi does not make Android One phones anymore, and there are some preinstalled apps from Xiaomi. Also, it's full of Google Apps that are spyware but from a different company...
iirc, they stopped producing phones with Android One around a year ago. So if you want to buy a new one you will have to get one with miui. Which is, like i said, is packed with spyware.
When i bought my Redmi 4a, as a backup phone, i had to root it and flash with lineageos, because the amount of telemetry that phone was sending somewhere was straight up absurd. Same story with Mi 8.