technically good, ethically unacceptable
You think you're buying a video projector, but when you switch it on, you discover a detail that's not mentioned anywhere in the product presentation: it only works if you have a Google account. The registration stage is non-negotiable. Xgimi customer service confirmed this to me by email. By buying the product, you agree to provide Google with your data free of charge. Similarly, to use the wireless connection, you need to be using Chrome.
So there's a forced sale of services associated with this product, which is also technically satisfactory for images that aren't too large.