What always rubbed me the wrong way about those is that they don’t see what I’m seeing. Yes, I slam my brakes sometimes, but it’s not because I’m driving dangerously. Sometimes animal come out of the blue, and what telemetry might show as dangerous driving could just as easily be me saving them money.
I can easily imagine a reality where insurance companies have access (intentionally or accidentally) and give you a higher premium because they found something that makes you more predisposed to some ailment.
The above is pure speculation, but it’s only one security breach or bag of money away. It’s never safe to assume that a your data is 100% secure at a (presumably) benign company. As curious as I am regarding certain aspects of my heritage, the fact that I have no control over what they do with the info is keeping me on the bench.
I realized a few years ago that my GF inadvertently solved this issue for me: She likes registering for anything that provides a discount, so I use her phone number.
“Are you a member?”
“Nope, but my GF probably is…”, and 90% of the time I am correct.