Right now you are free to choose to let the state know where you are. If you don't want them to know you leave your phone/Fitbit/devices at home.
To have it implanted gives up that choice.
Given that everything is hackable do you want foreign governments to be able to target you subliminally, know how you vote, know where you are, know what you buy?
Feel free to welcome 1984 but be really sure you know what that means