Perhaps there is another radical way of self-restraint and it consists in complete isolation of the player with problems of gambling addiction from all available gadgets.
 Of course, an exception can be made only for the simplest push-button mobile phone exclusively for phone calls. But it is clear that this extreme method also provides for the isolation of the player himself in some clinic where there is no access to the Internet or in some remote area also free from gadgets. But if we are talking about serious gambling addiction on the verge of insanity, then apparently this is the only way to stop the process of destruction of the brain of such a player.
And any self-control and self-restraint with free access to gambling from different IP, and with VPN, this is all certainly not an option for real restriction of access to the game.