The people that are making money consistently through gambling are called grinders
I don't think that exist such kind of people of players. Are only urban legends.
They exist and they are alive. You need to open your eyes more about this stuff and read how many proffesional poker player that make thousand of dollars atleast per week and millions per year. Their name exist, you can simply google them
There are quite a few professional gamblers living on gambling. But the game they play is usually not the one against the casino, but against people. The professional poker player can win a lot. They beat other people.