Or to put it differently, the more games you play the higher the probability that you will get a single bad streak that ruins an overall good path of winning streaks (where the user tends to believe the strategy works).
In the end, the house wins and the bankroll is the only source of reference for that.
That's right, of course, it can happen in exactly the same way. In the end, it always boils down to the fact that the casino will win by the amount of the house edge and any "strategy" or "technique", no matter how good, has a chance against it.
Along the way, any deviation from the probability of winning is pure luck - or pure bad luck.