This is The TechCrunch Exchange, a newsletter that goes out on Saturdays, based on the column of the same name. You can sign up for the email here. DoorDash filed to go public on Friday, meaning we’ll have at least one more unicorn IPO before 2020 comes to a close. For a high-level look at its numbers, I wrote this, Danny covered who will profit from the deal, and I noodled on the impact of COVID-19 on its business. I bring all that up because there is another COVID-19 impacted unicorn that…