My wife and I started using Amazon photos a while ago. I didn’t think that much of it first, but it was included with our Prime membership, and offered an automatic upload from our phones, plus free storage (for photos), so why not?
Fast forward a couple of years. We’ve since cancelled Prime, and I wanted to switch to Dropbox, which has comparable automatic upload, a mobile app, and superior sync with a proper linux client. But I couldn’t. Why? Because of this one (stupid) feature.