You would have to host your own software which can also fail, but then at least you could do something about it. For example, you could avoid changing things during critical times of your own business (e.g. a tradeshow), which is something no standard provider could do. You could also dial down consistency for the sake of availability, e.g. keep a lot of copies around even if some of them are often stale - more often than not this would work well enough for images.