I imagine that the self-storage business in the USA is a very low regulation business, much less than opening a restaurant for example. How is the regulation for a (non-bank) "safety deposit box" business in Sweden any different than a self-storage business?
According to Wikipedia[1], the USA has ~52,000 self-storage businesses whereas Sweden has only 112. So the USA has wildly more self-storage than Sweden on a per capita basis: one storage place for 6000 people vs 92000 in Sweden. Are regulations worse in Sweden because self-storage is not a thing?