[imgabe]

> A company will know that you just got paid and so charge you just a bit more for your chicken nuggets than they do when you haven’t been paid in two weeks.

I know there's various data apps can collect. On iOS at least it seems like you have to grant permission for the app to access most of it. But how on Earth is this supposed to work? How does the app on my phone know if I just got paid?

[nerdponx]

Because another app knows you got paid, and that information was sold to some data broker, and now McDonald's knows.

[imgabe]

But then McDonald's could just buy the information. They don't need an app on my phone to get it.

[raw_anon_1111]

It’s not because the app knows - your credit card company knows and it sells the information.

[SamuelAdams]

For me I have a recurring calendar appointment reminder for when I get paid. So anything that requests calendar access would know that.