It is not a lottery.
They are giving random RATIOS of cryptocurrency, that add up to the amount of USD that you pay.
So if you pay 200 dollars, you could get 100$ of litecoin and 100$ of ethereum. OR you could recieve 25$ of doge + 175$ of Bitcoin. (both add up to 200$ USD. Minus their fee obviously)
That's not a lottery. It is a fixed amount of USD value.