I don't think that would work. You only get cancelled if you catch the eye of a social media mob. If it's just some random person complaining that X is a racist then I'd bet X's employer would side with X. "No, trust me - I hacked into Twitter and this anime avatar who says racist things is totally your employee. Hello? Hello?"

You could threaten to call up a random person's employer and call them a racist unless they paid you. Seems as likely to work as this would be.

You would need someone high profile enough to get the attention of a social media mob to really threaten people.