Amazon has invested $2.75 billion more in Anthropic, an AI startup seen as a competitor to OpenAI's ChatGPT. This is part of a broader spending spree by cloud providers to gain an edge in the AI race, with Amazon providing cloud services and chips to Anthropic in return. The investment will help Anthropic develop more advanced generative AI models, but raises concerns about potential risks and regulatory scrutiny given the circular nature of such partnerships.