1) People don't understand they're being monitored. I think this is a good reason to be mad. People should have some understanding of the agreements they make. It's part of being a functional adult in the world. It's also annoying that the companies keep spinning this as a tool to improve your driving, when it's clearly an attempt to price insurance against a person's actual driving habits.
2) The system's assessments are opaque. I don't have a good sense of how accurate any of these measurements are, nor what system is in place to ensure that. If the information collected is consequential enough to double a person's insurance costs, there should be some effort expended to be confident that the collected metrics actually reflect reality. I didn't see anything like that in the article, maybe I missed it, but it shouldn't just be some random team in a private company doing their best.
3) People's driving habits shouldn't be shared with insurance companies. This one ... this one I think is not great. It looks like the shared data at least tries to be anonymous -- they share driving behavior and times, but not actual location data. Heck, I'd be fine with scrubbing the times and just sharing the hard start and stop and speeding numbers (assuming point 2 above is addressed). I get that a knee-jerk defensiveness about privacy would make Thomas Jefferson proud or whatever, but we strike balances on public welfare and private freedom all the time. If you're itching to manufacture 1 gram of ricin to put in a sealed glass vial above your mantle, too bad, you can't. Cars aren't ricin, but they are the shortest path between most humans and homicide. If this kind of intervention induces people to be more careful to keep their current insurance rates, I think that's reasonable. Driving like a maniac is not a human right or a protected characteristic.