It's useful as a demonstration. More popular databases might see this and decide to include the feature as well. The best case would be if, say, Apple included

It's useful as a demonstration. More popular databases might see this and decide to include the feature as well. The best case would be if, say, Apple included a plausibly deniable file system or database by default on their systems. Now that even your grandma has it, its presence can't signal a secret.