$12k in damage by guest staying 2 days

A guest stayed 2 days in an Airbnb in Alaska, and caused $12,000 in damage by leaving the tub running.

www.ktuu.com/content/news/Airbnb-benefits-Alaska-a-local-host-says-but-is-it-worth-the-risk-489196241.html

I thought all bathtubs had tub overflow plumbing, specifically to prevent this kind of problem.