Thanks, I didn't know about c6g, m6g, r6g. I've updated the post to remove this mention - I only counted a1 instances.

That still leaves storage optimized and GPU optimized instances missing. I'm guessing storage should be easy enough to add, but what about GPU?

From my novice experience with GPUs, they need finicky drivers that must be ported by the GPU manufacturers, so I figure it might take a while to get competitive ARM GPU instances.