Money is not a problem for gamblers, unless broke. This self-exclusion actually is just like fooling ourselves because its real purpose is not realized, that's from my personal point of view.
These are good points and I am certain that since gambling-related issues are psychological, psychological approaches should be used to tackle them as well. Self-deprivation like exclusion and locking out funds may only limit but will never cure the issue.
The main point of my statement is that self-exclusion that is a feature of few casinos out there seemed to be like a negative feature as a gambler could just easily choose to gamble to other casinos once he lock his account and realized the urge is still there. Casinos should only offers more games, and more bonuses that will attract more gamblers and satisfy them, they should not think of any feature that is related or could prevent gambling addiction as their main business is to serve people hence it's already expected that once a gambler opted in, they already understand what responsible gambling is.
If a gambler gets addicted, it's not anymore the business of a casino since it should be taken cared of outside casinos. Remember that casino is a business, their main goal is to generate revenue and will only happen if they could retain loyal gamblers and attract new. Self exclusion is discouraging gamblers to gambler, that will hurt the casino's revenue.
This may not be genuinely common among the owners but some will still place humanitarians above their selfish interests. This is also the reason why we have rules and government, and any risky business is often mandated to have some disclaimers on their website/platform and casinos in sane countries cannot dare to avoid the self-exclusion feature on their platforms. Although the government may not be strict in regulating and enforcing this feature, it is a good one that the casinos have done their part, especially for those who are facing psychological issues that are gambling-related.
So, we're not in a banana republic where casinos will do as they like, they must obey the law of the land even if they do not want to do it as the law balances things between the casinos and the gamblers. Above all, morally, I believe that casinos must feel for the affected and offer help as they can, and not just be as selfish as you want them to be.