Amazon has at least two generations of their own homebrew ARM chip, the Graviton. They offer it for people to rent and use in AWS, and publicly stated they are

Amazon has at least two generations of their own homebrew ARM chip, the Graviton. They offer it for people to rent and use in AWS, and publicly stated they are rapidly transitioning their internal services to use it too. In my experience Graviton 2 is much cheaper than x86 for typical web workloads--I've seen costs cut by 20-40% with it.