So how will Google Image Search look if Google uses the keywords obtained from the game? Here's ESP Image Search, a search engine based on the data from The ESP Game. Unfortunately, this search engine has a small index (around 30,000 images).
So, let's compare.
Image search for "China" on Google:
Image search for "China" on ESP:
The search engines have different sets of pictures and ESP shows the results randomly. However, it has better results.