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.
This is one of the reasons why I consider the team to be very innovative. There's always something new each time I check the exchange. They never seem to stop giving updates on the next product to be launched that explains why the value of the tokens are always on the moon.