Duelbit becomes on of the most popular and used gambling site now so yeah small capital is enough to make way to win big.
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.
Apart from the giveaway that gives tens or hundreds of dollars, the promo code is worth between $0.25-$0.50 if you use it to play slots with a minimum bet of $0.1, you can only spin 2-5x if able to get a big win from that amount then how lucky you are, it's hard but still possible.