To be honest, I still dont quite understand how there is people around internet even suggesting gambling can be a reliable way to earn money (as a gambler). Gambling is a business and in order for a business to survive, it is supposed to be profitable, if there were a reliable way to gamble and defeat the house, then gambling would not be a business anymore and those big resorts and casinos in Las Vegas won't pay themselves.
Only see gambling as a hobby and if you even find yourself having a good luck streak and pocketing some bucks, then be sure to enjoy them (or part of them) instead gambling it all away.
I agree with you and real evidence that we can see and it is simpler is that no casino has gone bankrupt.
From the understanding you said and the simple words I said, it is very clear that gambling not the right place to make money or double money but is more appropriate to entertain yourself looking for fun with friends or alone to enjoy luck that will come but if you are not lucky consider it just an entertaining game.
The problem with news on the internet is that I also read a lot of article about how to make money from gambling and I think this something ridiculous, whereas gambling business runs to make money, not to give money to gamblers, so gambling will never give big wins from small bets apart from luck, even when we are lucky, we always get problem related to being accused by gambling parties of making mistakes.
so still the casino wins and we will lose and how amusing yourself will be much more fun than misleading yourself from the hope of a big win.