Is there much merrit here for action on a VPN for the phone, instead of actualy tyring to fight against the OS' iOS & Android etc, to bottle neck all traffic th

Is there much merrit here for action on a VPN for the phone, instead of actualy tyring to fight against the OS' iOS & Android etc, to bottle neck all traffic through VPN and filter out everything.. Even depending on the Android to allow self signed certs is too risky as they can flip descisions on a whim.. I know it's not the best solution as it requires some loe from the user but I have this configured and its just worth it. Because waiting on the vendors to clean up their act is futile given how much money is being made..