There's a total of 595.2 TB of data exposed on the Internet via publicly accessible MongoDB instances that don't have any form of authentication

A quick search for MongoDB reveals that there are nearly 30,000 instances on the Internet that don't have any authorization enabled. This was actually a bit surprising since by default MongoDB listens on localhost and has done so for a while based on the oldest Github checkin for their mongodb.conf. 
There's a total of 595.2 TB of data exposed on the Internet via publicly accessible MongoDB instances that don't have any form of authentication. 
​https://blog.shodan.io/its-the-data-stupid/