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.
Even at that, making profits in gambling os not still guaranteed and at most some time you end up losing more than you win, so anyone that take gambling as a profession or a full-time job is doing so at their risk and the next destination may be addictions or possible indebtedness.
So for sure the significant changes that the mate mentioned will definitely be negative financial changes or even possible philosophical changes at most and this is not a road that anyone should take at some point.