See here. Crossover is based on the same thing as Proton, which Steam Play uses.
Funny though, it works in Windows with AMD. Guess the open source AMD driver is incompatible with pro NVIDIA written software, Wine is pro NVIDIA.
I’m to cheap to buy a NVIDIA card. I’ll wait for the Intel dedicated video cards. Will the Intel cards have vGPU? Then no more passthrough bullshit. Just one video card.