Was having trouble booting so tried multiple different versions of Proton. I now get an error pop-up leading to a page saying Denuvo has locked me out of activating the game for 24 hours: https://imgur.com/a/qHugRfJ. I'm guessing because Proton runs in a container, Denuvo sees each attempted launch as trying to activate with a new machine. If this is the case, be wary if you're having trouble launching the game like I was.