Sorry for I didn't think it clearly enough. Yes for a default of 0.5% max win with a 1% edge, it's impossible for a player to take the bankroll through a single bet, it only happens when the max win is 1% of bankroll under 1% edge. But the chance is just too tiny which is like a jackpot

Will you be allowing investors to specify the maximum percentage of their investment that they are prepared to risk on a single roll?
It's possible that some of them wouldn't want to risk 50% of their coins on a single roll no matter how high the house edge was.