And there are runtimes and services implementing their own APIs, and there's emscripten which is how most people actually use WebAssembly today. But if you're n

And there are runtimes and services implementing their own APIs, and there's emscripten which is how most people actually use WebAssembly today. But if you're not porting existing software and only care about the web, these APIs are not very relevant. Oh, and WebAssembly also looks very different if you are using it for smart contracts. This is due to the fact that WebAssembly was not specified with an API to actually use it. But it's okay. CPUs don't ship with an operating system either. It doesn't make them useless, nor prevents multiple operating systems from existing.