If they win, they can use $100 to play a lot on Duelbits and from zero risk, they can multiply the $100 to higher amount. A lot of time left to join this one. Good luck.
I remember years back that i even wait for the code in instagram to take 20cents to play lol.
but most of the time i lose my chance

Stay tuned for next codes, next contest and try your luck again. Duelbits are very active with promotions. They do no harm first but gamblers can enjoy codes and try themselves with luck.
In contests on Duelbits, you can use small amount to bet so $100 capital (if you win) for contest is huge.
Duelbit becomes on of the most popular and used gambling site now so yeah small capital is enough to make way to win big.
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I saw a few gamblers who try multipliers contests and won very big. From free redeem codes, no harm to big awards, that is absolutely amazing experience. I think winners do love those redeem codes and contests on Duelbits.