I was just screwing around today with data like this. I was making it to have as a exhibit at a up coming event at my university
https://bsky.app/profile/balsa.info/post/3lh7z776lbk2w
You connect to a special WiFi SSID and compares your traffic to known tracking/ad domains (Pi-Hole Lists mostly) and the "food" is the packets being sent to those servers.
its crude and has some high false positive rates, but it does have a chilling effect for me when exploring what data is going where