Lego are incredibly inconsistent and unclear with the rules they make for contests. Several contest winners we’ve had for Bionicle and other themes would be outright disqualified based on certain rules, if not for Lego changing the rules midway through the contest or after the user has won the contest.
One rule for example during the ‘Mask Hunt’ originally prevented someone from winning multiple prizes. However this rule was changed after Lego ignored its own rules and awarded the same person, a twitter user whose account was filled with contests they were entering, the prize of a bunch of the sets along with providing them with one of the Golden Masks.
At the end of the day, these are Lego’s contests, they can set the rules how they like. However there are rules in place that contests such as those run by Lego must abide to - and changing the rules of a contest midway through or directly contradicting rules established at the beginning of the contest is violation of the FCC’s Rules
Edit;
As clarified by Eljay, the FCC do not have jurisdiction over Lego due to the companies location. While Lego would not be abiding by the rules of FCC, as mentioned, it is not under any laws to do so. There may be a Denmark contest ruling, however we’ve been unable to locate it.
I didn’t, i just don’t count that one as being a legitimate contest given the rules kept changing and the winning entry was one which had pieces used which were unavailable to others, therefore providing them with an advantage over other users.