Denuvo will revoke your licence to play a game if it thinks you've installed the game on computers with different hardware. Issue is it gets confused by changing the proton version that runs the game, thinking it's a new install on a new computer, and so quickly bans you from playing the game.

That, unfortunately https://www.404media.co/doom-the-dark-ages-drm-is-locking-out-linux-users-who-bought-the-game/ namely that each new Proton "install" e.g. switching version because there is a bug counts as a new install which are limited.

For the bigger picture https://www.defectivebydesign.org/