Two things: a) The current players would refuse to cooperate. Making web services accessible to end-users but impossible to scrape efficiently is a solved prob

Two things: a) The current players would refuse to cooperate. Making web services accessible to end-users but impossible to scrape efficiently is a solved problem. b) You're hungry and tired and you're about to spend $30-$50 on takeout food rather than cook yourself. Do you care that much about a $.50-$1 saving that you search for food search engines on your meta food search engine search engine? In insurance, a market where people are much more price conscious, there are several different price comparison sites which all aggregate slightly different subsets of the insurers.