tl;dr: Six weeks after Bun's much-hyped "Rust rewrite" was supposedly merged, there's still no release tag, open PRs from Claude have nearly doubled to 2,475, and Anthropic employees are increasingly involved in ongoing work. The author argues the widely-cited $165K rewrite cost is misleading—actual spending likely approaches $800K when factoring in continued Claude credits and CI/CD—and that the project is being used as marketing proof of AI coding capability to support Anthropic's valuation. Similar AI-rewrite projects (Anthropic's C compiler, Cursor's FastRender browser) have gone silent for months.