Yes it is, you know the forum's traffic keep declining and in order to protect the current traffic, the forum need to not be strict, that's why many plagiarist didn't get banned except they keep repeating the same mistake. Unlike in 2018-2019, if you only copy one sentence, you could get permanent banned.
Traffic is declining, which I also believe is part of the reason why the moderators are being lenient with their judgement these days, but that doesn't mean all rule breakers can get the same judgement, as they might definitely want to abuse those privileges.
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The prize is given by administrator, someone who can access everything, so if they didn't bother about it, we can say it's allowed as long as they didn't get caught.
Since the forum is not against Altaccount only abusing, it is what the forum and its members don't consider likely. If the account in question only participated in the contest with one account, I don't think there is anything wrong with that unless it has been proven otherwise that both accounts are in the same contest, and until proven, the person will definitely be walking free. 
