body: I made a mod for this free online indie web-browser game. A snapshot of the website 2 weeks ago on waybackmachine.com shows no copyright logo or Terms of Service anywhere on the page saying it's copyrighted. The developer of the game found out about my mod and tweeted that he would get it shut down. The developer has since put up a Terms of Service on the game's website that says all works are copyrighted and modifying the game is illegal. He then contacted google and got my mod taken down and I received a copyright strike on the chrome extensions store. 
  
  
  I don't really care about the mod anymore but can I get into legal trouble for this?
  
  
  Edit: I should also add that the mod I made was free and the game is also free to play.
  
  
  
title: Can someone claim copyright infringement after-the-fact?