Matherly, who completed Shodan more than three years ago as a pet project, has limited searches to just 10 results without an account, and 50 with an account. If you want to see everything Shodan has to offer, Matherly requires more information about what you're hoping to achieve -- and a payment. "
How does the fact that he charges for it mean that it's "almost exclusively used for good"? I would argue there is very little incentive to pay for something like this unless there is a monetary gain.