Real-Time Command Blocking App

I need a mobile app that can instantly intercept and block any command issued on a user account. The solution has to run on both iOS and Android and work the moment a text or voice instruction is detected, cancelling it before it reaches the underlying service... (Budget: ₹1500 - ₹12500 INR, Jobs: Flutter, iOS Development, iPhone, Kotlin, Mobile App Development, Objective C, PhoneGap, React Native)