For example, say you as a small time inventor have a valid patent on some great new widget. Big company X starts selling the widget you invented, you approach them and ask if they would license your patent, Big company X can afford to keep filing IPR's against your patent and it will cost you ~$200,000 each time. Big company X can milk you dry and draw things out for years so it becomes much more difficult as a small business to defend and license your patent. Lee seems to have really helped large tech companies at the expense of small inventors.