I have started to think this is the real reason why so many apps have a messaging and voice chat features, not so they can orifice this services to you, but so you'll grant the access so they can spy on you and sell it to advertisers.
I randomly decided to try my hand at pottery using clay I've dug up from my yard. Talked about this in person with a few people, but hadn't posted anywhere online about it. Suddenly, Amazon is suggesting pottery equipment and supplies to me.
If an app attempts to use the microphone in the background, it’ll appear similarly to a phone call, but orange or red in colour.