You can ask them how much they take, they take 20 percent. Everything is a chance not a guarantee , they say in small print you can enter for free.
People actually win. It is not a scam unless they have promised you something and don't give it to you. They do give some to charity you can just ask them how much they take and they will tell you, that's what I did.
I hope I win the Judd Apatow thing because you don't need to donate as much. However it's not a gurantee so at least I'll be giving some to charity if I don't.