By keeping the knowledge to herself, she is slowing down the society's progress on destroying Denuvo. She also created a single point of failure. If she is gone, a lot of that knowledge will be lost. What will the community do then?

I'm not saying she doesn't deserve to earn money for her work. But she has the power to make it easier for other crackers to crack Denuvo. With enough people like that, maybe Denuvo could be destroyed entirely? Wouldn't that be a more worthy cause to support? But it seems that instead of actually helping the society, her priority is to be the only one who benefits.