Most brokers wont allow you to short a sunpenny issue.
News flash Bubba...... these aren't "most brokers" or entities naked shorting TICKERS. Want to know who "they" are~? Banks, Broker Dealers, Market Makers, Family Offices, Hedge Funds........... is that CLEAR ENOUGH for you~?
Access to market data, trades, money, the algorithm, and with each other makes for a VERY VERY criminal enterprise. RICO should no doubt be involved. They know who they are, and so do shareholders. This goes for not just $DBMM, but for many other tickers as well.