Take that API scraping script example. Imagine next you want to build a platform where you run code written by your users who want to e.g. scrape APIs. Think ParseHub I guess? Zapier is another good example.
You'd let them write in Rust or some other language that can target WASM, then you'd run the WASM blobs in a controlled sandboxed execution environment in your platform.
So basically: what every single platform with plugins should be doing to protect their users. Or similar via some other language that allows sandboxing, e.g. Lua.
OK, OK, it’s a bad example. WASM is language agnostic though, so as more languages can target WASM, then the possible advantage is programming language agnosticism. If I have some code, I don’t have to re-write it in Lua.
You'd let them write in Rust or some other language that can target WASM, then you'd run the WASM blobs in a controlled sandboxed execution environment in your platform.