How's the offline app support? My full library (30k items) is available on my phone (not in high res). There are a lot more concessions I'm sure.
"because a company that sells you Cloud storage has very few incentives to give away more local storage, or compress/optimize the files generated by its camera app." might be more accurate
It's not why I use sync services. All my photos fit on my devices (more or less). But I want to have seamless access to my files from both of my devices. And most importantly the sync is my first line of backup, i.e. if my phone gets obliterated I don't loose a day or two of files and photos, I only loose a couple of minutes.