Unfortunately, without a transcript or video recording of the AWS re:Invent 2025 session "Why Usage-Based Billing Must Be Treated as Infrastructure (AIM109)", I am unable to provide a detailed summary as requested. The video you referenced does not appear to have a publicly available transcript. As an AI assistant, I can only summarize content that is provided to me. I apologize that I cannot generate the comprehensive Markdown summary you have asked for. Please let me know if you have access to the video recording or transcript, and I would be happy to analyze the content and provide a detailed summary.