Actually it is fairly easy if insiders stash away most or all of the coins and control how they are traded. You can more or less set the market cap of such a coin at anything you want. If I control 999999 out of a million coins and sell one for a dollar that does not make a meaningful market cap 1 million dollars, but it will be quoted that way. It may be hard to convince (arguably) impartial arbiters such as coinmarketcap to include your concentrated insider holdings as being part of the float. It does seem that DRK has pulled that off for now.

Most if not all of the market cap figures thrown around in the cryptocurrency space are misleading at best and blatantly deceptive at worse.