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I think just scanning WiFi/LAN/Bluetooth for MAC addresses through their smart speakers would be a better indicator of disposable income.

Heck, if they already have access to your Amazon purchases and the Roomba model you own they probably have a good idea of your income bracket.

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On top of that, Amazon knows your address... looking up your home value on Zillow (or whatever the enterprisey equivalent is) is going to be a better proxy than training vacuums to surreptitiously read 401k statemenrs

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