Every B2C startup I have ever worked at has basically put a non-trivial component of their "product" efforts into finding some clever way to screw over customers and feel good about it at the same time. I've had YC startup teams describe fairly horrific ways of monetizing user data with a gleeful smile on their face ("It is really in the user's best interest!")
I've listened to interviews with phone scammers before and basically their worldview is that they're ripping off some first-world asshole who would be just as happy to destroy the scammers own country if it could make the cost of consumer goods slightly lower.
I suspect working for a ransomware company would at least mean you don't have to pretend the awful things you are doing are for the greater good, and I suspect also contains a bit of the phone scammer view that the people you are attacking are ultimately your enemy as well.
It's far more surreal when I've had to check into work, plan all day how to rip-off or exploit users without losing them, and then be cheerful about what a great customer focused team we are.
“Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience.”
― C. S. Lewis
I've been wearing an Apple Watch for close to 10 years. I've tracked my weight as well along those years but nothing crazy like OP. The Apple watch tracked plenty.
I had some strange symptoms and two doctors insisted I had a weak heart and potential heart failure. This was shocking! Turns out I do have a really "weak" rhythm, but heart failure is when your heart is progressively getting worse in it's pumping. I don't even remember which metric he looked at in my Apple health - but basically my heart has always been this way. A doctor looking at a single data point might think I have abnormally low blood pressure/heart rate, but if I've had this for 10 years with no change, the medical assessment is very different - it means nothing. Sometimes boring data is exactly what you need. For this reason, I will probably always wear an Apple watch (or equivalent) moving forward.
Data can feel useless for 10 years until one day it becomes critical. The benefit is spiky and uneven.
The lesson, I think, is everything is relative. Even a dashboard with flawed data that is "consistent" can highlight anomalies. And often, that's all you really need out of them. (Or the lack of anomaly)