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Google photos on ios is literally a hostage situation. Remove key functionalities like copying an image or editing an image unless you give them full unrestricted access to your entire photo library. (The holy grail of surveillance capitalism data). Data extortion masquerading as a service.
Ah, but if you run out of space in your backup, you might think "I'll just delete some of those photos from my backup".
And then you go back to your device to find it's deleted them there too!
I see that. But this is more of a use case issue than a google photos has too much permissions issue.
If you want to delete a photo you need full permissions to that photo.