I think they're down temporarily. All their coin-pools seem to be down, so they're probably having some issues with their server.

http://dgb.smalltimeminer.com appears to be down as well. MPOS is running, but the stratum servers have been down since the 20th.
https://pool.chunky.ms/dgb/ also has 0 workers and 0 hashrate, and haven't found a block in the last 3 days. Though I'm not sure whether they are just unlucky or if the stratum server went down as well.