Card counting is generally less effective in online blackjack due to several factors. Many online casinos use automatic shuffling or continuous shuffling machines, which reset the deck after each hand, making it impossible to track the cards. Additionally, online games often feature multiple decks, further diluting the impact of counting. While card counting could work in live dealer games that use real decks, the effectiveness is still reduced by factors like frequent shuffling and surveillance. Online casinos may also monitor betting patterns and impose limits, making it harder for players to exploit a count advantage. Overall, card counting is much more difficult to apply successfully in the online environment compared to land-based casinos.