Apps can’t “scrape your device for useful information”. Modern apps are sandboxed and only have access to what you gave them permission to. Usually, they just gather the information from within the app. What you clicked, when you clicked, why you clicked, etc. If you give the app permission to location data and contacts, then they’ll grab those, too, but you always have the option not to.

This is why companies, like Google, Amazon, Meta, try to push their own devices, they can have full access to your data.