A special case is the fake XiaoMi products, for example the Yi action camera 2. This camera is real 4K, is produced by Yi Technology and this company is not selling or advertising it as an XiaoMi product, but only the sellers and some people from Internet are using the XiaoMi brand name along the Yi just to sell the product or obtain some traffic site.
Previously, Yi Technology had some partnership with XiaoMi, obtaining from them the permission to use the XiaoYi (not XiaoMi) brand name which was very close to XiaoMi. But never, any Yi camera was produced by XiaoMi, but by Yi. XiaoYi.com is also owned by XiaoMi.com so Yi was forced to obtain their own domain after their partnership ended.
Because the XiaoYi name was very close to the XiaoMi name the sellers started to use the XiaoMi name instead of XiaoYi just for selling purposes. Of course Yi company was very happy with this "mistake" and was the chance of their life to have big sales, or even they suggested in some unofficial way to international sellers to use the XiaoMi name near Yi. In some places you can find the Yi camera as XiaoYi Yi camera.
When the dashcam was launched the connection between XiaoMi and Yi stopped, XiaoYi.com starting to redirect to actual Yi site.
There are rumors that their partnership ended because Yi advertised their first dashcam to use the A12 chipset, printing A12 over the Novatek NT96660 which was in reality the chipset used in their camera. But I think more that the XiaoMi was not happy to see focus problems at Yi action camera, then the same focus problems at their dashcam and considered this is affecting their good reputation. Or maybe they became jealous on Yi sales? Because they also know that if the Yi had not the XiaoMi name the Yi could be just some camera with focus problems.
enjoy,
Mtz
P.S. I know some people will tell me that the first Yi camera was listed on some page of xiaomi.com site Chinese version, but this thing is not transforming the Yi camera as an XiaoMi product because is not made by XiaoMi.
This thing is like an VW dealer is selling also the Skoda cars. But even the Skoda is now owned by VW, that cars are not sold as VW or Bentley (also owned by VW) but as Skoda because are made by Skoda factory. If you will find on some Chinese version of xiaomi.com the Yi camera, that is an Yi product, just like Skoda.
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... but you have to look at results! They are