Let's be clear here. He's not saying "do this, it's in your benefit." That would be cause for skepticism because Mark is a VC in competition with other VCs. What he's saying here is that some firms engage in a particular type of unethical behavior. This is reporting on an industry trend. It's even a falsifiable claim despite the fact that we are tremendously unlikely to have access to the information that would confirm or refute his claims.