I have come across different numbers. Some argue that only 1% of players are profitable in the long term. Others say that less than 1%. Still others claim that the number of such players is 0.01%.
If you find those numbers, does that mean someone actually did the statistical data collection, or is it just speculation from people you met?
Your question will have a fairly broad subject, and it is difficult to get accurate statistical results. If you want to continue looking for answers to your questions, maybe you should focus on a particular betting site first. But of course, it will be difficult to get the data too. But if you are only looking for a few samples of bettors, maybe you can get them.