Elon Musk's Grok appears to be losing momentum in the increasingly crowded artificial intelligence chatbot market, with new traffic data showing declines on both its mobile app and website, even as rivals like Claude and Gemini continue to gain users. According to Forbes, Grok's average daily users fell by more than 10% from March to April. The decline is notable because Grok entered 2026 as one of the world's most-used AI chatbot apps, but it n…