COSS Weekly: Cal.com Goes Closed Source, Mistral Borrows $830M for Data Centers, OpenAI Acquires Promptfoo, and more

This week in COSS: Mistral raised $830 million in debt financing for AI data center expansion, OpenAI acquired Promptfoo signaling a growing focus on AI security, and Cal.com made waves by going closed source in a move that sparked debate about the future of open source software security. Self-hosted AI automation stacks featuring n8n, Dify, and Ollama are gaining traction, while PrestaShop announced a formal collective restructuring process and Starburst unveiled an AI-powered front end aimed a