Yes. It is. And if the casino realizes that you're doing it, you'll be banned from the casino.

So most people who do this come up with clever ways to continue to do so while being less easy to detect, like having multiple people work together. One person stays at the table, betting at a fairly constant rate, while signaling to a partner when the odds are in the players favor so the partner joins the table and places big bets.

The thing is, this all takes a good amount of work and effort, requires a sufficient bankroll to begin with so you don't just have a small run if bad luck and run out of money, and does have some risk of gambler's ruin or just getting detected by the casino and banned.

At some point, it's just a risky investment combined with a job. And you can probably do better by just starting a company or investing your money and getting a job.