It depends. Outside of the three families who originated the Holy Grail Ritual together, almost no one knows about the true intention of the Holy Grail War. Most Masters, like their Servants, believe that it's just a way to get a wish granted. So the Servants aren't really being tricked then, if their Masters are being tricked too.
But there has never been a winner of the Holy Grail War, so it has never reached that point where a Master has to turn on his Servant.
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But there has never been a winner of the Holy Grail War, so it has never reached that point where a Master has to turn on his Servant.