When a parent is anxious about the child enough to install a bloody tracking app. The parents is giving the data about the child to the criminals.
That sounds unlikely and more paranoid than the parents who would install those apps… How many criminals are going to data brokers to track their child targets?
I think the be careful what you do on Facebook is implied. He’s highlighting something that’s less expected, where you may need to be careful what you do on Windows systems.