AMD pays Blender at least $140,000 annually and after two years still no Vulkan support and Blender removes all support for AMD GPUs and optimized Blender for Nvidia exclusively. (Cycles X) :
Thomas Beck on Twitter: "For all #macOS #OpenCL #b3d users: We're discontinuing Blender's support for Cycles OpenCL rendering for Mac OS due to the countless compiler bugs that can't be fixed properly. #