For what it’s worth, iOS does warn when an app has full access to the photo library for a while. E.g.:
> "WhatsApp" has been able to access your entire photo library for 6 months. Do you want to continue to allow full access?
Screenshots: https://macreports.com/app-has-been-able-to-access-your-enti...
Yes, but it's not clear to a regular user that an app can access this camera roll without a user's input.
That just tells you that it has the permission. It doesn't give you any information about how the app is actually using the permission does it?