Just like many other casino that never shows how they draw the giveaway just to make an engagement for there social media.
I also saw multiple entries not just in the iPhone raffle but also in the 5$ and 50$ draw every Tuesday. I already posted and ask this, that they provided a proof on how they draw the winner from 50$ draw but I saw many duplicate username on the sheet that suppose to be 1 slot per username. Most of the winner has more listed username on that Sheet.
Hope coins.game can do something better for the drawing especially when it comes to a big reward like the iPhone.
Although it can be said as a free promotion where participants do not need to spend money to participate, but make it more transparent and fair will always be a better thing.
Maybe they can use the one which is being used by Little Mouse to draw the $15 winner of the crash contest, I think it is much more better way to draw a winner fairly.
Coming up to the multiple entries, I'm not really sure about the rules. But if it is 1 entry per user only, they should delete all the multiple entries first before the draw to make it 1 per user.