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Im not sure I understand. You have to walk through a setup process to actually opt in, so not doing anything is opting out. I dont intend to set it up as its designed either, have done nothing, and nothing is happening (its not setup).
If you want to I get rid of the notification in the app you have no choice but to go through to set it up than undo the option than unpair. It is the only way to get rid of the notification block in the app for each car. Annoying but it is the only way I could not find a simple opt out option to remove the notification