Ideally betting like a pro requires a lifestyle change and when you take up gambling as a lifestyle you will experience significant financial changes.
What aspect of financial challenges are you expecting? Is it negative or positive growth because there is no guarantee with being a professional gambler. No doubt that you would also be making some profit but he will also be losing big because he will have to stake higher. I believe maybe streamers can have probably a steady outcome either they are in collaboration with the casino but to be a independent professional gambler doesn't have a guarantee of financial break through.
Challenges of becoming broke.
I don't really believe someone could consistently make a living out of purely gambling or betting on a specific casino, because no matter how good or how pro you are with Poker and other table card games, there are always gonna be a person who's better than you or equally as good as you, not today but maybe tomorrow. You win some, but most of us have lost more. So, in order for someone to make gains consistently he needs to do something like these streamers do. Yeah, I'm talking about referrals and endorsements, get paid to invite more users while you're actively gambling with your own money.