Is that really a career?
The way I understand the word is, you become well known professional in the field, you have employment history, you have successes that you can really present to the public.
If you're an online casino player who doesn't stream it, doesn't publish it anywhere, has a good betting history, but doesn't win a ton of money, just manages to have constant results, like $500 a month, that's not a career! If you martingale on dice earning a few bucks each time, that's not a career. If you play slots every day for an hour, that's not a career.
The only gamblers that could call it a career are people who play in poker tournaments, people who are paid to stream their games, who are employed by casinos... 99% of gamblers are just gamblers. There's no career to talk about.