You seem to be thinking about "adblocker running in browser", since you brought up EULAs.

That's not what OP alleges - they are saying people are redistributing modified versions of OP's copyrighted code. DMCA is an appropriate measure in such a situation, but it's unclear why OP's DMCA takedown was rejected by GitHub. Without more detail, it's hard to comment further

one would think, if it is still up there, OP might point us at it so we can see for ourselves, right now it's "trust me"