Card counting is ineffective in online blackjack because most online casinos use automatic shuffling machines or virtual shufflers that randomize the deck after each hand, making it impossible to track cards over multiple rounds. Additionally, many online games use multiple decks, which further reduces the effectiveness of counting. Even in live dealer games, shuffling is often randomized or done in ways that prevent card counting. Online casinos also have sophisticated algorithms to detect unusual betting patterns, which can lead to account suspensions. Therefore, card counting is not a viable strategy for online blackjack.