Well, I've checked that their actions require just 1-2 minutes to take part in and each winner gets 100$. That's pretty nice and easy, so why not? But the number of participants is quite big so you have to pray for luck 
In any case easy money is great.
That's right! I am delighted that developers do not stop looking for and coming up with reasons for users to make a profit, as well as to learn more information about the project. In any case easy money is great.