Correlating that they’re together wouldn’t explain how the ad networks figured out they were outside looking at houses. MAC addresses are never transmitted pas

Correlating that they’re together wouldn’t explain how the ad networks figured out they were outside looking at houses. MAC addresses are never transmitted past the first layer 2 hop, so it would require either a compromised switch/access point (like public WiFi) to be nearby and the phone to connect to it (phones randomise MACs when searching for networks to protect against that).