It isn't that simple. The SEC goes after them when it can. But debt financing isn't illegal; it's also used by exchange-listed companies in responsible ways. However, those financing agreements aren't floorless, though defaults can happen, and when they do, the effects can be disastrous for the companies and for their shareholders. Floorless agreements aren't illegal; I don't know whether anything could be done about that.
KMA is suing HJOE for breach of contract. And HJOE did sign a contract.