I lost money most in fiat casinos because I have known them since many years ago unlike crypto casinos that I know about 5 years ago. As long as you register on a casino and you started gambling, you are most likely to lose because all the games are most in favour of the casinos and not gamblers. In fact, most games in crypto casinos are in fiat casinos except just few. They are just the same if comparing which one is riskier.
You are absolutely right that's the real truth about it because the two are quite the same thing. They are all highly involved in losses so it is only when you approach it wisely that you would be able to control the losses without losing much. Because just like as you mentioned, almost everything that is the fiat casinos is also what is the crypto casinos, so it is left for the gamblers to do it in a responsible way rather than chasing losses.