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) :
Open source 3DCG software 'Blender' enhances support for AMD GPUs in version 3.0 - GIGAZINE
Blender 3.0 Goes to the Next Level with AMD GPU Support - Render Pool-Cloud-based GPU rendering
Blender 3.0 takes support for AMD GPUs to the next level. Beta support available now! : r/Amd
Radeon™ RX 540 Graphics | AMD
Open source 3DCG software 'Blender' enhances support for AMD GPUs in version 3.0 - GIGAZINE
Cycles Render using AMD Radeon RX570 - Technical Support - Blender Artists Community
1万円ちょいのグラボ! AMD Radeon RX 550レビュー | ギズモード・ジャパン
Blender™ | AMD Radeon™ ProRender | AMD
Supported GPUs in Blender 2.80 — Blender Developers Blog
Blender™ | AMD Radeon™ ProRender | AMD
Blender 3.0: Software and Hardware Requirements | iRender
Next level support for AMD GPUs — Blender Developers Blog
Blender 3.0 takes support for AMD GPUs to the next level. Beta support available now! : r/Amd