Microsoft's AI coding assistant, Copilot, is injecting promotional ads into over 1.5 million GitHub pull requests, a significant shift in how generative AI tools monetize. According to developer Zach Manson, a PR generated by Copilot edited its description to promote Raycast's Copilot extension, inserting a message about spinning up tasks. A search reveals this same promotional text appears in over 11,000 PRs across thousands of repositories.

However, the raw markdown of affected PRs contains a hidden HTML comment, 'START COPILOT CODING AGENT TIPS', suggesting Microsoft itself is inserting these ads, likely to promote its ecosystem or partner integrations like Raycast, Slack, Teams, VS Code, and JetBrains IDEs. This development underscores how AI tool providers are pivoting towards advertising revenue as the subsidy window closes, mirroring OpenAI's recent success with ChatGPT ads.