Gluten-Free Toilet Bowl Cleaner?

I saw this product at Berkeley Bowl. I read the back labels on household chemicals like this. Some toilet bowl cleaners contain ingredients that can damage the plumbing, like hydrochloric acid. This product befuddled me. At the bottom of the back label (below) it says that this product is ‘GLUTEN FREE.’ Now, I don’t doubt that they are telling the truth about this product being gluten free, but what’s the point? Do people drink this stuff? Toilet bowl cleaner isn’t a beverage.