I don't support this so called stop loss feature but it's better to have that in place, it's for gambler's preference and option, some gamblers will use it, some will test it, but if a gambling site will use it it's better that they do a study first, they could lose money here, because they are stopping the flow of money from gamblers.
If a gambler can use the feature correctly, it really helps him because he doesn't have to feel difficult to control his time and money. After all, if he tries to use all of his money to continue playing gambling, he will see the limitation applied from his account, and he can see why he can not continue to play.
I agree with what you said that the gambling site needs to study or research or make a poll to their user, and maybe they can try to apply the feature for some time, maybe a week, to see the result.
If that feature can really help the gambler to limit their loss, the site can continue to use that stop-loss limit to prevent a gambler from getting a big loss.
But that will affect the gambling site income because a gambler will not have a chance to spend too big money playing gambling.
The feature will have an advantage and disadvantage for both sides, the gambling site and the gambler, and maybe the owner needs to think about a win-win solution for their members.
If the owner can get the right way, that can make them be a good gambling site because they think about their members, and they will not let the gambler lose too big money.