Child abduction by a non-parent is exceptionally rare. Each year there are around 200 of them, of which 90% make it home safely. That means that your child's risk of being abducted is about 0.00027%. That's absolutely no basis to justify this awful technology on, and no reason for you to worry as a parent. Not to mention: the abductor could just take your spyware watch off of the kid.
source: https://www.fbi.gov/file-repository/2016-ncic-missing-person...
"Of the 647,435 records entered in 2016, the MPC field was utilized in 315,995 (48.8%). When the MPC field was utilized in 2016 entries, 303,237 (96%) were coded as Runaway, 2,107 (.7%) as Abducted by Non-custodial Parent, 303 (.1%) as Abducted by Stranger, and 10,348 (3.3%) as Adult - Federally required entry."
So it looks like one should take the number 303 for "Abducted by Stranger" and perhaps, since only 48.8% of records had this field populated, extrapolate to about 620 cases. Does that sound right, or should it be 200 based on a different reasoning?
Of course, 620 cases is still a pretty small number. I just wanted to understand where your numbers came from. How did you get the figure of 90% making it home safely, and how did you calculate the probability of 0.00027%?
https://www.creditdonkey.com/kidnapping-statistics.html
Then I went to the source to verify that the information was there, but didn't re-run my numbers. I apologise, that was lazy and misleading.
Kids are much much more likely to face abuse from a family member or close friend than they are to be abducted. The sheer rareness of Amber Alerts (not to mention their effectiveness) are a good indicator of that fact.
We've got pretty good systems in place for dealing with kids who are merely lost. Dealing with kids who are abducted is another story, and a tracker definitely helps there. It's a sad reality that we have to worry about that situation still.