I think right now on every website.
Not every website.
You can setup self-exclude by timer. Example on (Stake) you can set-up by one month self exclude after one month your account will be unlocked again. If people can't handle with short-term hold.
Stake might offer it which is great, but many other sites don't.
For example - Fairlay - has a very high limit for bets, especially on US sports, and you can easily bet there $5,000 - $20,000 on a game there, even more.
Now let's talk hypothetically, take this all as some hypothetical case scenario, not necessarily a reality but still:
Take someone who doesn't want to spend that much on US sports, so he is banned from Stake because they self-excluded him but he cannot ban himself from Fairlay.
What does he do? Contact Fairlay? They won't help him. These guys have an instant link registration, 100% anonymous, 0 details about yourself, not even an email.
And this is just 1 example. Might be tons of other sites out there.
Okay, so if you save your money in your bank account you can't use it with a site like Fairlay, you might be able to use it with your own local website e.g. if you are UK based then Ladbrokes, William Hill etc. - these sites do offer proper protection and are proeprly regulated.
However,
Say you save your money in Crypto, you got $15,000 USDT and you don't want to be tempted to gamble it away - whether it's Fairlay, trading, Binance, day trading - there are lots of way to lose money these days, do you agree about that?
So there you have it - that's a solution that works,
because your money is locked away from you.It's not only for gamblers, but for traders, or anyone with small or big addiction -
you arrest the addiction by taking what you're feeding it with away from it - that's how many gamblers made better lives for themselves - by arresting their addiction - this is just 1 example.
Does it help to improve self control? Oh yeah, for sure, you would only make better decisions moving forward by not acting swiftly and carelessly and thinking about the money locked away much more than simply handing it over as if it was a piece of paper worth nothing.