I don't agree that we are being "spied" by Google, Meta and Microsoft. By using those platforms, we are giving our permission for our data to be used for marketing purposes. It's not spying if you are aware that your online behavior is being tracked. Spying is only when you don't know.
I don't know about whether or nor our smartphones are recording us. I usually hate wearing my smartphone in my pockets and I don't keep my smartphone turned on for very long periods of time. You can do an experiment to prove your theory. Talk about something in front of your smartphone and then do a Google search(or Bing search) about the thing you talked about.