I'd rather play loose in those big tournament, since the blind normally rises up quicker than my stack. So you need to win some hands at early game to avoid being short stacked. Also, in freerolls, I don't want to waste hours of time and ending up with winning nothing. So I don't mind to gamble in early game. E.g. I would like to go all in preflop with QQ against AK. In the middle game, when the money is close and my stack is not too big, I play much tighter and fold hands like AQ, JJ... if anyone raises and if I have big stack I would play more aggressive to take advantage of people with short stacks.