SpaceX just raised $75B: Worth buying on day one?

This Week in Startups: SpaceX's record-breaking IPO hits the market, Mistral nears a €20B valuation, and Polsia founder Ben Broca returns to discuss building AI-run companies. Plus the $5K Live AI Fact-Checker bounty finalists, Siri's stance on romance, MrBeast hits 500M subscribers, and more.