Well, I found a very big reason to NOT use the Fi tracking collar, at least if you have an iPhone.
It drains the shit out of your phone battery.
I noticed my battery was draining faster lately and I started suspecting this app. It's responsible for 22% of battery drain.
2 minutes of screen time. Almost 10 hours of background time.
"Fi ran in the background for 6h 59m longer than usual."
I was traveling with Sam, about 30 miles away from home. What is even going on here?