In the interest of not having my game be spread around the internet without my permission (I don't mind people playing for free, but if someone puts ads on my game, I want the money from it!), I'm currently trying to write code that figures out where my HTML game is being played, and redirects to itch.io if necessary.  I'm using Unity's WebGL, so it's also strange from that perspective (I can call external javascript but firefox gives all sorts of security warnings when I do).  Are there any suggestions or recommended ways of doing this?  

Also, what are the servers that itch will serve from?  In particular, I see hwcdn.net, are there others I will have to assume exist?

Thanks in advance.

For other people trying to do this, here is the simple solution I'm using:

    private void CheckWithUnity() 
    {
        string urlPath = Application.absoluteURL.ToLower();
        Debug.Log(urlPath);  // For determining where I am hosted
        if(!urlPath.Contains("hwcdn.net"))) {
            ChangeScene.changeSceneStatic(28);
            GameObject.Find("Music").GetComponent<AudioSource>().Stop();
            Application.OpenURL("https://polypogon.itch.io/wisdom-collector");
        }
    }

Well, I just discovered the I need to sitelock my HTML5 game because the game just got uploaded to another site just one day after of being uploaded here. I like the automatic sitelock idea.

Gotta lock your deals, so they don't get stolen.

An update for people who happen to come across this topic: We deployed a global javascript-based sitelock that’s automatically applied to all HTML5 games.

If your game is loaded on an invalid domain, it replaces the game with a banner that encourages to viewer to go directly to your itch.io page. It should help capture traffic from the sites that have been trying to steal itch.io CDN urls up until now. Thanks!

If you have an issue or any questions about it, please post here: https://itch.io/t/614172/sitelock-update