Between WebAssembly, Cloudflare Durable Objects/Workers are the equivalents from Fly.io, it seems we are finally recreating the features of IBM System/360 mainframe from 50 years ago, in terms of portable code that could run reliably and scalably even with faulty hardware. WebAssembly is the modern 360 Assembler that allows you to compile once and run anywhere. (Kubernetes is the modern JCL)