IndeedI think it's a legitimate approach to a freeroll. It's annoying for other players, but if you can double up once or twice early then you have a chance. Otherwise, you might play for three hours and get blinded out eventually.
I'll do this, go all on questionable hole cards, just to see if I get lucky. When there are 5000 players going after a share of a $10 or $50 pot, I do this sometimes.
CardsChat freerolls are much better quality of play, I don't do that in these freerolls.