Everyone's going to call it the biggest initial public offering ever. They'll talk about rockets, Mars and Elon Musk. But they'll be looking at the wrong business. That’s because the SpaceX IPO isn't really about launch vehicles.It's about Starlink—a satellite internet network that has quietly become one of the fastest-growing telecom businesses in the world. And it's growing like a startup.Starlink Growth EngineThat's what makes this IPO interesting.Valuation Debate ShiftAt a headline valuation of about $1 ...