I wanted to write an essay about Microsoft and TikTok today, because I was effectively a full-time reporter covering the software giant when it hired Satya Nadella in 2014. But, everyone else has already done that and, frankly, there’s a more pressing financial topic for us to parse. Let’s take a minute to take stock of SPAC (special purpose acquisition companies) which have risen sharply to fresh prominence in recent months. Also known as blank-check companies, SPACS are firms that are sent public with a bunch of cash and the…