There was a documentary on Prime Video a couple of years ago that followed a card counter as he moved from casino to casino living out of his RV. I think he was up around $600K after one year. He was having to get kicked out of small casinos all over the place and keep moving to new ones every few days. At one point he tells the camera crew that he has to start driving 1/2 a day to skip over a few spots to stay ahead of the surveillance. It didn't look easy but not impossible. He got to set his own hours and be his own boss.
There is an entire niche of casino streamers (see kick.com). They basically get free chips and can more / less keep their winnings, but the real money is in all the referrals from people who watch them, which are likely the highest paid referrals on the entire internet given the value of each user. Much easier to earn a living gambling-as-entertainment than gambling-to-win