Denuvo will lock you out of games if you keep changing Proton versions

Although for some of us this is a well-known problem, it has appeared again with the release of DOOM: The Dark Ages so it's worth a quick PSA to remind people about Denuvo activation limits with Proton on Linux, SteamOS / Steam Deck. Here's the thing — Denuvo Anti-Tamper games do work on Linux systems when running a Windows game through Proton. However, Denuvo has a set limit on the amount of activations it allows per-game. This is five systems it detects within 24 hours. The problem is on Linux systems with Proton, you might be trying to find the best version of Proton to run the game with, especially so for new releases. If you keep changing your Proton version this can trip up Denuvo and count each Proton swap as a new activation. What happens then? You get locked out for 24 hours. So keep in mind for games that have Denuvo Anti-Tamper to limit the amount of times you swap the Proton version.