Self-storage businesses are not universal. There are plenty of countries where they don’t really exist at all for individuals (only for corporate customers). There, people who are moving out of their flats and e.g. going abroad for a year and need to stash their stuff, are used to just finding someone with some spare space in his basement or garage. In my experience, people don’t really seem concerned about security; the real valuable stuff might be left with a family member while what goes into the storage space is just the furniture, kitchen stuff, and books.

But since finding a storage place is already a pretty standard part of the local Craigslist/OLX website in these countries, there isn’t much room for a new website to come in and disrupt things.