To be honest, I'm far happier with VWs data privacy policies compared to the free for all that seems to be the case with American companies like Google & Facebook
The automatic service appointment settings can be turned off anyway, if thats your concern. The other app features such as driving style analysis are no more intrusive than the insurance company apps that are commonplace, my dashcam already records speed and GPS location in case of accident so it's no worry to me, especially coming from a job where virtually every keystroke on my computer is logged, and all phone calls are recorded for audit purposes
Anyway, picked up two devices today from the dealer for free - plug & play as you'd expect, I'm sure the app will get more features added over time and the mileage logs/fuel tracking features alone will save me a stack of time each month for doing my expense claims for work