I believe other people are using any such storage as a cache, trading space for time, since even if you instantly found the exact replacements, you'd still pay not only monetarily for shipping but wall-clock for both shipping and the drudgery of searching for said items

Interestingly, I read a blog post where someone was using "fulfilled by amazon" as off-site storage, but I think it was a pseudo thought experiment more than an actual storage solution, similar to those folks who use data-as-video on YouTube as infinite backup storage