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.
Users of social networks give permission to collect and analyze general information about them, but we do not know whether this collected information is being used in good faith, or whether additional information is being collected that we would not like to make public. And this is definitely happening. Today's technological devices provide us with much more convenience, but they take away our privacy.