I think you are missing the bigger point here.
Most smartphone users cannot operate a local backup using a RPi. In fact, most users worldwide cannot afford to buy and run a RPi 24/7.
Most smartphone users are not able to afford a Google Drive plan that holds all their pics.
Most smartphone users are just not literate enough to even understand where they pics are, or that they may need a backup plan at all.
You cannot apply your life experiences to quite literally a billion people for whom smartphones are likely the only thing with a screen they own. And yeah, among those, plenty of iPhone users who bought it for cheap or got it for free with their cellular plan.
Yeah, we get it, you know what is needed and how it needs to be done, and you have the cash to do it. But maybe you should realize that you are the exception, a tiny minority.
You clearly live in a different world from most of us. I’ll leave it here.