I don't see many other people using Vulkan for GPGPU, and there may be many good reasons for that, but I wanted to try something a bit different.
A big reason is that C++ for Vulkan (SPIR-V) isn't quite there, while CUDA does C, C++20 (minus modules currently), Fortran, Haskell, Java, C#, Julia, Python JITs, and anything else that might target PTX.
SPIR was a late response after Khronos realized the world wasn't willing to be stuck with C for GPGPU, and the tooling is still catching up to PTX.
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A big reason is that C++ for Vulkan (SPIR-V) isn't quite there, while CUDA does C, C++20 (minus modules currently), Fortran, Haskell, Java, C#, Julia, Python JITs, and anything else that might target PTX.
SPIR was a late response after Khronos realized the world wasn't willing to be stuck with C for GPGPU, and the tooling is still catching up to PTX.