Js script is ugly and sometimes hard to do (put Js on every page) its much better redirect 301 or serve special page for scammer IPs
Cloudflare IPS never Access your site so redirect based on Cloudflare id useless
They use additional proxy and then sends to Cloudflare
SO Just grabb proxy IP by puting on your page PHP script that display Client IP and configure webserver to serve special page for particulal ip
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