I imagine the business model is the repackage the same thing under as many search term combinations as they can think that people would try to find a game like this. In food terms, like a restaurant advertising the same thing as, "BBQ," "Smoked Meat," "Southern Grill Food," "St. Louis Pork," "Tailgate Plate," etc. It's just pushing SEO into the actual name of the game.
This is partly Apple faults. They only allow you 100 letters for keywords, they no longer index the description, and they provide no feedback on what users used to find your app. So they give you no information that you could use to limit your searches.
There are a number of workaround for this, and one is to upload the same game with slightly different title until you hit on the magic combination that gets you sales. It sucks to have worked hard on a game, and it fails because of the wrong combination of title and keywords.
Who searches for games based on the thematic metaphor? I think it's more likely that people search for Bejeweled or Candy Crush, and unscrupulous and uncreative game creators want to muddy the waters and siphon off some of that money.
