So this is the Dark Side of The Cloud.
Now I'm waiting all the more in anticipation for the winner of the JEDI contract... now THAT should be a real hoot if something goes wrong...
If you put it into a PUBLIC place, lots of people may see it, and you have little to no control over who's able to access the data. After all, it's on an Internet-facing server with an unknown security configuration.
If you host it yourself, it's more PRIVATE and you have more control. You can opt to put sensitive data on a server that have no internet-facing, or is even air-gapped from the internet. Much better, plus YOU have full control over the security configuration, and should something go wrong, you can pull the plug quickly, so to speak.