i do not think it is unethical or scam to look at other player's hand , if you dont do this on purpose , if he doesnt hide his hand , why is is your concern i do not get it . if he is silly and keeps on not protecting his hand , then he should be punished for this , better way to punish him by taking his money i cannot think . ofcourse if he is a whale and he is freerolling very lower stakes for fun the losses wont stop him from doing this .
i mean if he shows that he has AA , you see this because he didnt hide his hand , what should you do ?? pretend that you didnt see the hole cards , play as if you didnt know what he has ?? call and lose ?? ofcourse no.
Now if he keeps on doing , despite your warnings , well if you look again and see his cards i do not think it is a crime , he is stupid , he is the one to blame . so..........