You don't need to buy a company to use its systems in an attack. The odds of discovery and disclosure ahead of time increase massively if you go through a major

You don't need to buy a company to use its systems in an attack. The odds of discovery and disclosure ahead of time increase massively if you go through a major company's decision making processs as part of your hacking process. Companies are people. Lots of them. They are consequently not good at keeping secrets, particularly "I'm hacking the world for evil" secrets.