CUDA extract, cublas is seprate

I found after extraction. cublas is sperate from cuda-tookit, which is very strange.
e.g.
sh cuda_10.2.89_440.33.01_linux.run --extract=$HOME/.local/cuda10.2
we have
cublas cuda-samples cuda-toolkit EULA.txt integration NVIDIA-Linux-x86_64-440.33.01.run
I understand cuda-samples and driver should reside in different folder. but why cublas?