Someone has made an android Webview app using my website and adding adblock to it. And it is stealing more and more visitors from my site every day. Is there a way to block this App from using my website in webview? If there's a way, I am willing to pay for it.
Request from android can be detected, but whether they are from webview or browser is difficult, besides that even if you do some work around, the headers can be manipulated to create a genuine HTTP request from browser.
You could potentially filter them out via user agent but that might interfere with users who visit your site from a android browser.