I find this self-exclusion stuff hilarious to be honest. Why should gambling sites even provide such options when it's easy to do it on your own in the first place?
If you are a gambling addict, there are far better ways to try and control your addiction instead of depending on sites themselves to help you out.
Do stores provide an option to not sell cigarettes to help a chain-smoker control his/her addiction? They don't because it's not their responsibility. Same applies to gambling sites in this aspect.
It's just part of the "Gamble Responsibly" cause.
I mean casinos can do so much, but at least they do their best to give players to option to pull the brakes, hence the self-exclusion.
Yes, we can question the point when players are likely to lose, but the responsibility shifts from the site to the player if they are unable to curb the desires.
Some players are reckless, but there are "smart" ones that will quickly freeze their accounts to avoid succumbing to another episode of addiction for the time being. I've seen players complaining about not being able to claim rewards or participate in events due to that, but at least the feature works to some extent.
The casino could always respond that the button is there for a reason, and it's not their fault if players don't utilize it and proceed to go broke in the end.
On the one I frequent on, they offer this on every profile, reachable in just two clicks. No need to contact Support and wait for them to respond.