They do their best to get your money. They monitor your past behavior to know what you're likely to listen to in the future. For example, if you eat basic burger/fry foods, they'll send you more ads for those types of places, but if you tend towards Mediterranean, then they will send you those places instead. As another example, dog food ads aren't worth sending to people who don't have dogs.

What I worry about is Alexa and the other voice boxes. Every time we talk about getting food around it, I open my phone and have ads for the places we were talking about. That's literally creeping on someone.

I'm not so sure about that. I'm no lawyer, but I do know that there's a lot of legal precedent for allowing people/things to operate a certain way, like land use. However, technology is still new to the legal system that's set in the 1800s.