Rating sites and online agencies can remove or refuse to publish a review for many reasons. What's more, the process is often opaque – which is to say, the site may or may not notify you and explain why it pushed the "delete" button.

The problem isn't that this practice occurs. These are, after all, businesses that have the right to publish whatever they want.

Instead, it's that they often present themselves as trusted resources that will help you "know better." But if reviews are indiscriminately deleted, are travelers getting the full picture? Maybe, maybe not.