What is a been qualified as a professional gambler in your own world? The winning part or the responsible part of trying to avoid addiction is all.
A professional gambler is someone who consistently earns profits through skill-based strategy, manages their bankroll with utmost discipline, avoids emotional decisions and dont rash things, and practices responsible gambling to prevent addiction which means only play with the funds that you are ready to loss and accepts it. In other words limitations.
These are some of those that makes someone a professional gambler. Ofcourse kinds included if his always winning.
On my end, a professional gambler indeed knows how to manage himself in front of his games. He knows when to pause or stop his games as he's considering his resources before plunging himself to trouble.