They don’t need to listen to audio, which is very cumbersome and error prone, if they have your location. If your location is available, so are all of your frie

They don’t need to listen to audio, which is very cumbersome and error prone, if they have your location. If your location is available, so are all of your friends’ locations. The apps can easily see who’s in the same place at the same time and generate a “friend” network. Presumably you talk to your friends about your thoughts, and they talk to their friends. All it takes is a few people to start googling something new (or looking up products in Amazon, or searching for the same tags on Instagram, etc etc) in this network for the algorithm to realize this might be something you’re ALL talking to each about, and thus advertise straight to you, giving the perfect illusion that whatever you’re talking about is advertised back to you.