Gregory's ServerIt's not finished yet, but I decided to implement a web-demo of this for different browsers. You can visit https://traumweh.dev/not-monetizable/ and you well get this warning in your browser's style based on your User-Agent (I know, not reliable).
Alternatively, append "firefox.html", "chrome.html" or "safari.html" to the URL to see the specific versions. They are still WIP and the latter two might not look the same across browsers. Might add more browsers soon. Who knows.