Once you accept an invitation to join a bundle, you can’t leave. In my case, I realized after joining that my games don’t meet the requirements of the bundle. I was looking for an exit/leave button, but I can’t find one.
I understand that if you don’t add any games, you won’t participate anyway, but I get the impression that it would still be helpful to have the option to leave the bundle.
Thanks! 
We were actually working on this feature already! We just finished it up and pushed it live, so now you’ll see a “Leave bundle” button at the top/bottom of the page. Leaving a bundle will remove you and your products from it, and you will no longer receive any earnings from its sales.
You cannot leave a bundle if it is published, or if at least 1 sale has been made.
Thanks for bringing this up - it’s always great when we’re already working on features that people request 