Robert Hart is a London-based reporter at The Verge covering all things AI and a Senior Tarbell Fellow. Previously, he wrote about health, science and tech for Forbes . Scammers are using AI-generated videos of celebrities including Taylor Swift and Rihanna to promote shady services on TikTok, according to authentication company Copyleaks. The ads typically show celebrities in interview settings, such as red carpets, podcasts, or talk shows, and often manipulate real footage with AI, the company said. Many promote rewards programs claiming users can earn money by watching TikTok content and giving feedback. TikTok’s official branding appears in some of the ads, though users are redirected to third-party services that ask for personal information. In one ad, a realistic AI avatar of Swift urges users to sign up to a feature called TikTok Pay.…