It's not a clone, it's deobfuscated code from the game client that's being used in several sites to host an exact copy of the agar.io client, with their own ads. If you actually read the DMCA, it's pretty detailed in how it violates Miniclip's copyrights.
An example of clone that doesn't infringe their copyrights (written from scratch, not derived from the original game): https://github.com/huytd/agar.io-clone
An example of clone that doesn't infringe their copyrights (written from scratch, not derived from the original game): https://github.com/huytd/agar.io-clone
Disclaimer: I'm the agar.io developer