Hi and welcome to Cardschat. It continue to amaze me, that so many people expect everyone to play well in a freeroll. Its free, so of course a lot of people dont even care, if they bust. "Go strong or go home" can even be a viable strategy in freerolls, because then you only spend time of those, where you have a decent chance of cashing.
If you think a little deeper about it, what is actually worst?
To call an all in after 5 minutes with AJ knowing, you are probably going to be behind but with equity? Or play for an hour only to bust near the bubble? The first player only spend 5 minutes to win nothing (assuming he lost the hand), while the second player spend an hour to also win nothing. So who is even the real donk?