A casino is similar to a lottery, you expect to lose some, but also to have the (small) chance to win a lot. Coinbase is promising a fixed 4% earning. If they

A casino is similar to a lottery, you expect to lose some, but also to have the (small) chance to win a lot. Coinbase is promising a fixed 4% earning. If they are to be taken serious, 4% does not mean the risk of losing it all, like in a casino.