NYT article: "Driving Habits Shared With Insurance Firms".

Before I retired, the company put the GPS tracker nanny boxes on our trucks. Within a month, the thing burnt up the ECM in my company pickup because it was extracting so much data from it on the steep, curvy mountainous roads I had to travel on. It went to the Chevy dealer on a hook. GM would not warranty the new ECM nor the labor if the company hooked the nanny box back up. I took that as a win!! :)