It would be awesome to be able to port a simple Expo app (or the Hello World, or a Snack) to a mobile website without having to eject.
Currently using react-native-dom means having to manage entry.js / bootstrap.js / index.html and some Metro-specific configuration. I think Expo could provide a default and simple setup that makes sense in most cases to support react-native-dom.
We could also get an option to enable or not this feature. If enabled, Expo could also build and publish the website to its CDN.
Also opened an issue on the react-native-dom repo as I guess you would have to work in sync: https://github.com/vincentriemer/react-native-dom/issues/43