Good point! I am planning to add this description to the site as well.
There are two problems in stock photo search. First, there are multiple marketplaces with different inventory and price structures. So if you are looking for stock photos that are not very common, you need to go to multiple marketplaces, search and comb through the results. We solve this by using APIs from those marketplaces to bring results for your search so you do not need to go and repeat your search at multiple marketplaces.
This leads us to the second problem. You now have a lot of photos to comb through. This is where the AI comes in. You "like" few of the photos in the search result that are close to what you are looking for and the AI learns your preferences to bring the results that are similar to the ones you have liked.