Before Bitcoin became popular, the way to deposit funds in a gambling site was more common via Credit or Debit card, bank transfer, and even Skrill and Netelelr - all these payment methods required some verification, mainly to ensure that the payer is making a genuine payment and not a fraudulent one, but also for regulatory reasons such as money laundering.
With Bitcoin - everything has changed - no longer there is a need to verify the payment is genuine, because once the Bitcoin transaction (deposit or withdrawal) is confirmed in the Bitcoin network you know 100% it's irreversible, and the payer cannot call his bank asking to reverse or chargeback that transaction, because that's the nature of Bitcoin - it's a one way payment that once confirmed it's 100% irreversible.
Now whilst this makes life easier for many gambling establishments (i.e. no need to ask the user to send utility bills, proof of ID, verify the documents etc. etc.) - it still poses a huge problem to those having a gambling addiction problem, and let me explain:
1) In the past those who wanted to self-exclude themselves from a certain website - could have done so by contacting the website itself.
2) One the self-exclusion was in place the user couldn't create a 2nd account in that site because his details such as Date of Birth, Name, Address etc. were all already saved in the website database.
3) Even if the user would have tried to circumvent the exclusion - it would be very hard, because he would have to use a payment method under his name, so sooner or later he will get caught and might even get penalized (by waiting or paying %) for getting his deposits back.
4) But the bottom line is simple - the self exclusion in the old traditional betting sites was VERY EFFECTIVE.
Today, with the anonymous gambling feature - everything has changed.
Now you can create an account at sites such as Nitrogen, Fairlay, Sportsbet, and even if you self-exclude you could easily open a 2nd account (btw Fairlay has no self-exclusion feature at all, none whatsoever) - and if you are a losing bettor - then why would the site you're using ask you for documents? They are all proud of having anonymous gambling.
So without even getting into the issue of money laundering - the risk posed to gambling addicts who want to stop - is in some way unfair and unscrupulous.
I have created a thread about this about almost a year ago:
https://bitcointalksearch.org/topic/nitrogensportseu-betbitcom-no-sense-of-responsible-gambling-5079626Many comments were in some way hostile for not liking the idea of regulating the anonymous gambling industry or however you want to call it. The feedback from BetBit.com for instance was good one (post #39) - they actually did implement a self-exclusion feature in their site and have used a few more algorithms to protect the addicts from overspending in their site - however unfortunately most sites still prefer to keep the issue swept under the rug.
I think it's time betting websites will take the issue of self-exclusion more seriously or alternatively face legal issues from class action lawsuits that gamblers can file against those sites in the short or long term.