If they decide that you don't pay the license fee (doesn't matter if you really do), your live location will be beyond useful. They absolutely have the budget to implement the most invasive and abusive debt collection solution.
if they wanted to do that they'd probably have found another solution already through google's data at the very least. Probably apple/FB as well. Plus cell phone service providers.
I don't know why this new thing is your choice of how they'd get the data other than it being probably run as effectively as parler (edit: no data - gut feeling).
They somehow get this before Anmeldung, I lived in my apartment for 2 years before officially registering and received Rundfunkbeitrag letters + frivoulous copyright infringement notices (from a previous apartment).
> 2 years before officially registering and received Rundfunkbeitrag letters + frivoulous copyright infringement notices
This plus Jehovah Witnesses who stalk intercom labels and decide that you are a perfect (victim) fit for their "community", and you have the full German experience. Copyright bullies, debt collection predators, religious lunatics.
My address is no secret, where I was last friday night (and tuesday morning) is.