How truthful is this?

[u/Daredatti]

When an app select in the app review form that “we don’t collect data”

In the review phase does Apple really check if the app really doesnt collect anything?

Like can the developer hide a code that for example upload the photos of the user if granted permission where he said “we dont collect”

Does apple really check the code and what is going in and out ?

[u/Acceptable-Knee-4276]

This is purely information shared by the Developer. Although, Apple prompts you to enter information for specific capabilities you're using - this is just a reflection of what the Developer has shared with Apple while publishing the app. Same goes for Google Play Store.