Silicon Valley investors rejoice, the SpaceX IPO is taking flight as the massive space launch, AI, and social media conglomerate filed confidentially to go public. With a potential valuation of $1.75 trillion, venture firms and workers alike are set to cash in on long-held shares at last. Today, during our venture capital roundtable, Founders Fund’s @zebulgar, Harpoon Ventures’ @LarsenJensenUSA, Trust Ventures’ @SalenChuri, and LAUNCH’s @Jason (with @Alex in tow) took on the SpaceX IPO, AI’s…