Welcome back to The TechCrunch Exchange, a weekly startups-and-markets newsletter. It’s broadly based on the daily column that appears on Extra Crunch, but free, and made for your weekend reading. Want it in your inbox every Saturday? Sign up here. Ready? Let’s talk money, startups and spicy IPO rumors. Happy Saturday everyone. Despite it being a short week I feel pretty run over from the sheer news volume that we’ve put up with in the last few days. So let’s pause, repine and talk about SPACs as a nice little…