Usually that is true, but not every single time. You could get a lot of losses that will eventually make you run out of money and there is no return from there, it just doesn't work like that. I have seen people turn just a few dollars into thousands of dollars and then end up losing it all back again. Casinos have house edge on their side which means that it would not be possible for anyone to just keep on gambling and win.

If you gamble long enough, then you are going to end up with a loss eventually and that is the end of it, that's just going to be the case for sure, without a doubt. I hope that it gets to a point where it will not be possible for anyone to just keep on gambling for a long time and still not face 20+ losses in a row, if you keep gambling, you will reach that one day.
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I have an experience that fits this description recently. I manage to turn my 100$ bankroll to 500$ with continuous playing of Blackjack and other table games. I was supposed to withdraw all my funds after I hit the 500$ mark but the website didn't allow me to withdraw due to my transaction is still doesn't received enough confirmation because of the current mempool overload.

End result was I keep gambling using small amount, my 1$ loss turns into 20$ then I keep chasing it using high bet amount. I become less cautious on chasing loss that result on losing all my bankroll just because of chasing that small lose.

We human always being careless when we are on profit then chase minimal loss. We don't consider anymore how big our bet is once we are already on the profit side. This is the reason why it's easy to lose quickly when you are already in profit compared to when you are just starting to built-up our bankroll.