none of those technologies that you mentioned execute on the browser at all
sounds like you haven’t met webassembly yet :D
- https://github.com/seanmorris/php-wasm
- https://github.com/ruby/ruby.wasm
- https://github.com/m-butterfield/django_webassembly
please don’t take this as a recommendation to use that, but it does exist.
the image at the top seems to be the only real hint - it looks like it’s supposed to be for restricting which apps may run in the background while performing “secure” tasks in other apps