Guys thank you for your answers, and the time you lost for writing these messages. While giving you the question I lost 3$ and won nothing.
I thought that I will win, but the winner was another fake account of the owner of that scam.
Still, I believe that there are really good giveaway sites. But it should b hard to get to them
Atleast you're aware now that not all giveaways offering out there are legit, good thing its only 3$. Because there are other people desperate to win and spending their money not knowing its a scam. If you want to try it again better to check first how genuine it is to avoid similar situation again.