Earlier quoted context omitted.
Recent iOS versions have granular controls over library access to prevent this.
It isn’t nice to use though. You select your picture then when you need to add more you’ve got to go back into the settings for that app and select the picture. Then add the picture you selected. I’m grateful though. We would have called meta malware back when.
Limited Access to Your Library
"App" can only access the items that you select. The app can add to your library even if no items are selected.