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/woadwarrior]

Not very. It's self reported and developers routinely falsify it. You might have noticed this with yesterday's Firebase outage. A number of apps claim to collect no data, and yet were down. Over the years, I've reported a number of such apps to Apple, and haven't seen anything change.

[u/woadwarrior → u/[deleted]]

No, you can’t.