They have done pretty well with the open source OpenGL drivers that were also initially developed outside AMD.
AMDVLK was always a weird regression in the openness of the development model compared to that. Maybe understandable that the bean counters wanted to share the effort between the Windows and AMD drivers but throwing away the community aspect in order to achieve that made that approach doomed from the start IMO. The initial release being incredibly late (even though Vulkan was modeled after AMD's own Mantle) was the cherry on top that allowed RADV to secure the winning seat but probably only accelerated the inevitable.