iOS app blocking

Hello,

1) can I use NextDNS to block Waze and every other app in iOS that tracks and "steal" private data and tries to identify the user? can it help me to stay announymous?

2) what can NextDNS be used for preventing apps to send data and "phoning home"?

3) is there a limit on the paid app in regards to how many devices can be used under one account?

Thanks