Apple implemented a similar change for the EU App Store earlier this year to comply with the Digital Services Act (DSA), a regulation that now requires app developers to provide their “trader status” to submit new apps or app updates for distribution.
Photos -> share photo -> whatsapp
Instead of starting from whatsapp
Having given it that permission, I can share photos from within Whatsapp as well, without going to the Photos app. I'm not sure if the file picker that pops up is a Whatsapp component (meaning the "Limited" permission is essentially unlimited) or if it's a system component. I mean the latter would make sense, but I'm too cynical to believe it works that well.