They have toxic deathspiral financing and lots in default already. They are dumping billion of dilutive shares into the share pool. Investors keep finding that they own a smaller and smaller percentage of the company without selling 1 share? Ouch.
Imagine an investor owning say 3% of the market cap in early 2016.
Now they find that they own only around 1/2 of 1% of the company because the company is diluting as fast as they can to destroy shareholder value and line their own pockets.