Card counting in online blackjack is much more challenging than in land-based casinos due to factors like continuous shuffling, the use of multiple decks, and random number generators (RNGs) that ensure card sequences are unpredictable. Most online casinos, especially those with automatic shuffling machines, make it nearly impossible to track cards effectively. In live dealer blackjack, where a human dealer shuffles the cards, there might be a slight advantage, but even then, frequent shuffling or the use of a shuffling machine limits the effectiveness of card counting. Additionally, online casinos monitor betting patterns closely, and any irregular betting behavior could lead to detection and account suspension. Due to these obstacles, card counting is generally not a reliable strategy for online blackjack.