That's an advantage for them but it doesn't seem like an advantage to me as the user. If they change their sources behind the scenes, what I get as a user would

That's an advantage for them but it doesn't seem like an advantage to me as the user. If they change their sources behind the scenes, what I get as a user would probably change drastically. Google was great originally because their results were not just different and better but also reliable. If the back end changes without my knowledge that gets rid of the reliability aspect.