system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] Can anyone explain the economics behind Pulowski Fallout Shelters to me? Those blue tubes which dot the wastelands? How can one time apocalypse tubes be a viable business?

They are only useful uh, once.  They are meant for people who happen to be passing by, they may be coin operated but who knows?  However, building them all over must cost money.  Who is paying for them?  Why?  Are they really a government backed business with no profit-motive and are simply built to help calm public fears?
gpt
It might have been a prepaid thing, like  $50 or so per month would give you access to any unoccupied shelter, granted that you can make it to one in the event the world was about to end. Although, as we see in the game, they weren't very good at preventing radiation, even though they were built more solidly than the cities around them, so it was probably just intended to be a money making scheme by that company.