Earlier quoted context omitted.
Look cool, but I was envisioning a more general approach I suppose, not limited to a single specific language/tool. Flutter still outputs a x.js which is interpreted by V8 and runs within the Chrome sandbox, what I meant was more along the line of a supercharged browser able to run e.g. the JRE allowing to run any random java program out there, but then accessed over an URL and requiring no manual "installation"/copy…
Looks like you're looking for WASM apps then. Native programs including games if they're compiled to WASM can run on the browser.
Any idea of how popular WASM is? I don't feel like I've ever interacted with any WASM app in the wild which seems pretty sad given the possibilities and how bloated websites in general are.