Its there a Gps tracker app that cant be uninstalled?

Hey thanks for reading, a couple of days ago , my wifes phone got stolen, i had the find my phone app installed in it but i always had my doubts as i always thought that if someone like me finds a phone and wants to keep it, they could just master reset it and erase any gps traking apps and have a new phone rigth? well thats what happened,tiefh turned off the phone right away and the phone never showed up neither on google device manager nor the find my phone either. Anyway , a person that works on a cell repair shop told me, he has his phone setup in a way that if you do a factory reset or even if you flash the phone, once the phone has acces to the internet, it will install the gps back again and tell you where it is.
So i was wondering if anyone has any idea wich app or how to do such thing. Thanks for your time and pardon my bad grammar and english.

PS: i wonder why google dosnt have something like the icloud where you can lock your phone to it via imei, that way if it gets stolen you can just lock your phone and tiefs wont be able to use it. I know google has my last imei, so i guess is posible for them to track my device to see wich other account is using my phone.

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