The game starts, but gets stuck on the start screen. I've tried proton experimental, GE proton9-20 and proton 9.0-3 (all older stable versions don't start at all). I also tried an older Nvidia driver (560.35.03), but that didn't work either.

Denuvo Anti-Tamper isn't helpful at the moment either, because you can only activate 5 devices per 24 hours. However, each Proton version is seen as a new device, so if you change Proton versions 5 times, the game is blocked for 24 hours.

I'll keep trying.