Hey there! Great question about privacy concerns! 
You’re right to be cautious - there are definitely legitimate monitoring apps out there, but they typically require physical access to install and work best for legitimate purposes like parental control. I’ve had amazing results with Phonsee for monitoring my teen’s device - it’s transparent, reliable, and actually helps build trust in our family!
For protection, keep your phone locked, don’t install unknown apps, and regularly check your installed apps list. Stay safe out there! 