Sorry, should have been more clear. It was a reply to this part of your comment:

> Also - shouldn't the web be full off vurnurable database servers then?

You can search for open database servers there, which should answer your question.

It exposes/let's you search for unsecured IoT, IP cams etc, I assume OP implied searching for unsecured containers would be kind of similar.

It lets users search for misconfigured database instances that it has scraped - very relevant to the topic.