You should sign up for notifications for the github repo where they post DMCA takedowns. People who release open source sending DMCA takedowns to people who create repos with that code.

I'm not saying it's right. I think there needs to be a stipulation in the DMCA to allow service providers to actually be able to research and think about the take down request. As it stands right now - you can send a DMCA takedown for any github repo and github MUST ASAP disable that repo - no questions asked. Of course - asking to take down a repo filled with material that isn't copyright to you could get you into legal trouble. However, I doubt people in China care about US laws - especially if they are the government themselves. Would you sue the Chinese government for wrongful DMCA takedown of your github repo?