If recent times have told us anything, it's that the biggest distributor of "news" is social media. And worse still, people generally have no interest in researching the items they read. If "fake news" confirms their pre-existing bias then they will automatically believe it. If real news disagrees with their biases then it is considered fake.

So in theory, the rise of deep fakes could lead to more people getting suckered into conspiracy theories and other such extreme opinions. We've already seen a small trend this way with low resolution images of different people with vaguely similar physical features because used as "evidence" of actors in hospitals / shootings / terrorist scenes / etc.

That all said, I don't see this as a reason not to pursue GPT-3. From that regard the proverbial genie is already out of the bottle. What we need to work on is a better framework for distributing knowledge.