Girls, why do girls on dating sites have "Don't waste my time" or "I'm not here to play games" listed on their profiles?

Girls, why do girls on dating sites have Dont waste my time or Im not here to play games listed on their profiles?
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How would guys waste their time and what are the games both specifically because it is too non specific to tell what that means.. Anything could waste a girls time and games could take on any form. What ways are girls wasting time the most with guys and what games are they specifically referring to. Because it does not make face value sense to me.
Girls, why do girls on dating sites have "Don't waste my time" or "I'm not here to play games" listed on their profiles?
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