There is a reason why there is a "max bet", that Is calculated for being a very minimum of what could be the max bankroll, so the max bet is not like 25% of all bankroll, it is quite small (I forgot what it was but it was something like 1% or something) and that Is why you can literally have 50 people all betting max (and most of the time there are not that many people with that much money who would be willing to bet that much let alone at the same time) and you would still have a good bankroll.

There is literally almost no chance of bankrupting the bankroll because you can gamble at most the max amount and when you lose it you can't martingale it higher, so you need to keep try to win the same amount and when you do you may end up even further in loss as well.