Vast.ai – marketplace for renting out your GPU, or renting someone else's GPU
I found this service interesting.  This is how it pitches itself:"Rent out your GPU to make your hobby pay for itself. Transform your mining farm into a GPU training center and earn ~2x to ~4x more per gpu-hour than mining cryptocurrency. We connect you with customers and provide simple tools to streamline hosting. You set your own prices and schedules. Get started today."The biggest obstacle of course is security.The founders described it as "kinda like airbnb for compute" here: https://www.reddit.com/r/gpumining/comments/8xu04h/vastai_be...