As the world continues to work through how to handle the explosion of deepfake content online, it seems that not all AI-created videos are stirring controversy. Synthesia, a London startup building products around highly realistic AI avatar technology, says it’s a big hit with enterprises, with some 60,000 of them — 1 million users — tapping the tech to build avatar-based videos from text documents, for sales and marketing, for training and more. Now VCs also want to get in on the action. Synthe...