It's definitely possible to play blackjack for a living. It takes hard work, determination, and self control, but we are living proof that you can make a living counting cards at blackjack (not to mention the 100 people we hang out with at the blackjack ball, half of which are millionaires thanks to the casinos).
At the heart of online blackjack's functionality is a technology known as the Random Number Generator (RNG). RNGs are complex algorithms used by online casinos to ensure that the outcome of each hand is entirely random and unbiased.