I agree with you on this,  leaving a large balance as a bank roll will increases your chances of getting robbed on the long run just like what happened to the ops he was not guided enough or should I said he trusted that the casino will protect his money and privacy but reverse is now the case.

In the recent events were casinos either pulling and exist scam or getting hacked,  it must be appropriate to avoid leaving large funds in the casino regardless it be bankroll or just your balance.