I hate to rain on your parade but they did once accept DGB but as there was no real cause or merchants didnt want to accept it they removed it from there list...I know this for a fact as I have an account there & used to accept DGB on my web site...They emailed me a fair few months ago & ask me to remove all links requesting DGB as a payment option...sorry DGB isnt as popular as you think it is
I am going to call you on your comment, below are links to the GoURL website over time and there was never a DGB option available.
Could you provide proof that they have had DGB integrated into their system, if not could you confirm that your comment contained a fib (lie, untruth, fud)