The find my phone is on the 9, but it needs a Google account to work.  It could be a backdoor, but so could anything like the mics.  My point was NOT that the 9 is compromised, but more-so that these less expensive models would be great gifts to on-board people to freedom tech and privacy. 

 As an alternative I can recommend this app
https://gitlab.com/Nulide/findmydevice