Those are cards to earn from BitMax data storage. BitMax has a lot of products, trading products. You dont always have to trade to make profits. Theyve got transaction and reverse mining, data distribution rewards, volatility cards and a lot more products.
But even though that wasn't the number for the volatility cards, there is also a maximum amount of volatility cards one account can buy, right?
Yeah, it is restricted to 250 volatility cards per account according to their article on the project which I read earlier. I don't understand why they didn't make the number infinite though, could it be resources?