As long as there is a greed in the people. the scammers will exploit it and make people poor. We need to understand and use common sense when participating in these giveaways.
My unpopular opinion is that curiosity other than greed might have been the reason why some folks would respond to these giveaways. But like it has been said, "Curiosity killed the cat". Sometimes they know it’s probably too good to be true and they’ll probably lose some cash but they’ll go ahead and try it after all just to satisfy their curiosity.