Maybe because will be again a problem because of searching. When I was uploading videos from Yi cameras I didn't know what name to use for titles because people are searching for XiaoMi, not for Yi or XiaoYi. Sometimes I used XiaoMi but added tag with XiaoYi.
But we can see that official page it not contains even the XiaoYi as brand name, just as website owner. I think XiaoMi got so mad and put a pressure on them to remove also the XiaoYi name.
Finally, the Yi idea was great just for making money. They used something (Yi) very close to Mi from XiaoMi, then spread the hoax that their Yi camera is a XiaoMi thing. Then greedy chinese online stores saw this hoax as a good business because of low price and advertised a lot.
Hey, bloody, you know what you're talking about ???
If you don't know, say you don't know but no guessing OK ??
XiaoYi Dash Cam is manufactured under the Xiaomi Corporation, the 2nd largest Mobile Phone Manufacturer in the World.
You're listening right ???
Do you want to attend my Chinese class ???