Make it into a router and access point. Connect your phone to the AP and use tcpdump to capture packets from your phone for a few minutes. Look through the packets with Wireshark and see how much data is being leaked.
Luckily I already have a OpenWRT based router here (https://turris.com) and PiHole that says 22% of traffic blocked, not a small amount indeed.
Make an uber-pwnagotchi that can hash at it's own pcaps
First, you should something decent, not DietPi. You've Armbian for a ready to go experience or official Debian.
Once you get into something Debian 12, you can run LXD/LXC as a containerization / virtualization solution and use the same Pi to run the official HA VM image and whatever else you would like.
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