Maybe a dumb question, but can I run Krustlet in the browser? (maybe via browser WASI polyfill?). Does this mean you could assemble ad-hoc clusters using volunteer browsers? Not saying one _should_, but could you?
Krustlet is not in WebAssembly itself. It's an implementation of kubelet in rust that runs WebAssembly inside WASI or WASCC runtime, not other way around.
It sounds far-fetched, but I think it may eventually become practical with WASM and WebRTC, to use peer-to-peer networking for distributed computing.
Closest example in that direction, I've heard of malicious WASM payloads that mine cryptocurrencies:
Persistent drive-by cryptomining coming to a browser near you (2017)
https://blog.malwarebytes.com/cybercrime/2017/11/persistent-...
I'm optimistic that people will find socially beneficial application of this idea.