I've not seen these points made elsewhere, but they are obvious once stated:
Battery percentage, Bluetooth connections, and light sensor data can be used to re-identify you after switching networks.
Your new email, phone number, or payment method can be linked back to your old identity through data brokers, loyalty programs, and behavioral analysis.
Data collectors don’t care who you are—they collect everything. If laws change, or you become notable.
Current thread URL is the original author.
Perhaps you could have emailed to ask for a URL switch instead?