It's pretty much accepted that it's possible to count cards at land-based casinos. But many players will point out that counting cards are impossible at online casinos. In truth, this isn't true. It's perfectly feasible to count cards with online live dealer games. Having said that, much will depend on how often the dealer shuffles the decks. Or, as it's better known, the deck penetration. This is the most important factor and will decide if you'll end up making a decent profit over time.
We've all seen the movies where the fortunes of the characters are suddenly turned around with the discovery that one of them has the ability to count cards. In a matter of hours they win a huge amount and break the bank. Unfortunately, this is just the fiction of Hollywood. And though it's true that back in the day, real gamblers could make a decent living counting cards, those days are now long gone. Today you have to contend with sophisticated casino security. And nothing gets past them.