alt Hacker NewsYou can upload to itch.io yes: https://easel.games/docs/learn/publishing/export
The export basically creates a page with an HTML IFRAME in it that embeds the hosted version of your game on easel.games so that all the multiplayer and leaderboards continue to work.
Thanks for your interest!
What you're describing isn't uploading the game, then, but uploading a stub with a transclusion of the game. I'm not the same commenter, but surely that doesn't answer (what I see as) most of the implications of the original question?