> In particular I'm guessing you can't use it to track your kid's backpack either; for that, you should instead buy your 7yo their own iPhone.

You can - there will be spurious phone notifications and audible notifications.

Meaning: you can't, because the point of it is to help protect your kid (or, more probably, help find their backpack when they absent-mindedly lose sight of it), not to spam teachers with notifications and disrupt everyone with random beeping.