As Delfino say, you can not expect everyone to attempt to play "perfect" poker in a freeroll, because some people value their time more than the small prices at stake. This is why, you see some people be very aggressive and try to dubble up quickly fulling knowing, they are not a favourite to win a "flip" with 65 offsuit. At the other end of the spectrum some people sit out the entire tournament hoping to get lucky, when they are forced all in for their last chips and score a small cash that way without any other effort than registrering.
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