One thing you CAN do is write a disclaimer at the bottom of your pieces: "This was written on the Medium.com platform, in my Birth language of English. If you are reading this in a language which is not English, then this piece was illegally stolen and in violation of copyright laws. A key offender in this piracy is Ichi.pro." If they are using an automated service to pull out data and translate it en mass, they won't see your disclaimer when it translates.