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.
Gambling is an uncertain win-lose betting field.There is no guarantee that anyone will win a single bet. So it doesn't cross my mind whether this non-guaranteed gambling should ever be preferred as a major source of income. If there was a possibility of monthly or weekly profit from gambling then it could only be taken up as a profession or a job. But there is no guarantee that you can win from this gambler's bet every day. If you win one bet there is a chance of losing the next so this uncertain income should never be taken as a part time or full time job.