Can't win a free ETH if you use a simple database.
Unless you can give a reason why those examples require decentralisation then, as much as I respect your attempt at finding an actual use for decentralised Merkel trees, I ultimately think it’s doomed to failure.
I'm actually interested if you can think of a reason too. This is an incredibly difficult brainstorming exercise. So many ICO's have failed to justify their use-cases, but tokens are so interesting that I have to believe there are good reasons to use them. Is there any case that you do find particularly helpful?