This is the result of all the years of data mining and tracking. Now they can see your phone is at an open house and make an educated guess (which is all it is)

This is the result of all the years of data mining and tracking. Now they can see your phone is at an open house and make an educated guess (which is all it is), that you're interested in buying homes. All your web traffic is tracked too, unless you only use sources that explicitly do not track, such as duckduckgo.com. Check out https://ssd.eff.org https://ssd.eff.org, you might find it helpful.