It's only obvious if you gamble constantly and incessantly as mathematically you will eventually hit a unrecoverable losing streak due to lack of funds but many gamblers can stay in profit without bankrupting themselves so its not a gurantee for the small percent that are really lucky or have the relevant skills to make good bets. I think casino gambling is also much easier to lose on then say sports betting. Casino games are usually ramdom whereas sports you can use educated guesses.
Unrecoverable losing streak? I dont think so whether you are doing it depends on howw much fun do you have, if you have big you can go big base bet to earn more if you have small amount you can't ever get big. There are many people that always do this kind of things thats why they have so many losing streak before he can recover it. Play smart in gambling if you want to earn