Ask HN: Hypothetical Scenario

This person doesn't exist and being able to put a person face (deepfake for mountain, work etc selfies gallery) and Facebook groups with GPT-2 fake discussion. What could this hypothetical (which assumes that we both get through Facebook wall to register accounts on scale with phone numbers and verified emails). What could this hypothetical event be stopped from interfering in shaping someone's opinion about products (losing weight), political votw choice and others? Edit: GPT-2 from openai isn't free yet and opened. And also deepfakes are illegal.