TikTok touts itself as a platform where creators can stand out and build a following. But the company has begun discussing with advertisers an artificial intelligence-powered feature that would generate avatars to star in videos—virtual influencers that would potentially compete with human creators for ad deals.The feature, which is still under development and could change, would generate a script for a video ad based on a prompt submitted by the advertiser, as well as an AI-generated influencer...