Yes, these tiny tools to search the whole web for websites.
Remember what this blog here is mostly about?
Yeah, the world of advertising.
You won't find every banner ad from every tiny company, but many international and big banner ad campaigns are to find there.
In the example above, I searched for Coca Cola and got 69 results.
By far not every Coca Cola banner ad found its way into the register of Moat, but 69 ads are many, though.
If you ask why there is a search engine for banner ads, then read this explanation to find on Moat.com (click to enlarge):
>>>Link to Moat.com<<<