My friend has actually won a green card through a website like that (unofficial) he forgot about ever applying and people from this website spent considerable time and effort to contact him and let him know that he won, they called his Russian phone number and got a hold of him miraculously, I am pretty sure had he applied directly through the official dvlottery site, he would never know that he won. so sometimes this type of sites do what they say.
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This site does something similar for green card lottery: https://www.usafis.org
They do offer a clear disclaimer though.
My friend has actually won a green card through a website like that (unofficial) he forgot about ever applying and people from this website spent considerable time and effort to contact him and let him know that he won, they called his Russian phone number and got a hold of him miraculously, I am pretty sure had he applied directly through the official dvlottery site, he would never know that he won. so sometimes this type of sites do what they say.