Stoping is just too difficult for addicted gambler to know or do but rather a gradual decline would be okay if they are ready to do that. The major focus on this is to gamble responsibly and with what they can afford to lose. When a gambler goes by this principle, I think the issue of being insensitive and irresponsible when gambling would not be a thing to worry about as they already have the knowledge of it and would stick to it no matter the turnout event. The people making gambling as their source of income are people I think have no option than doing such because they believe that they can earn a living from gambling and they just put their interest and their whole focus there not minding the consequences of their actions in the future.
Several times, we have seen that some gamblers addicts have made some 100% withdrawals that have bounced back to where they were before or even worse off at the end, so for sure it is prudent enough to say that total withdrawals have a counter negative impact on the addicts but having little timely approach that works for long term.