If you want to get into checking, they are several accounts that were created a couple of days ago or the same day of this mini-event (you can see who likes, then the profiles).
Since you can add and remove likes on the fly, it's easy to manipulate the final result (especially with a small community like Destiny).
You can win the first price, you can win the second, choose which price you prefer by removing likes or adding more here and there... you can even win multiple prices if you think about it.
Still, thanks for the event Arashi.
I wanted to point out that exploit for future events.