First I’d hear of this. I looked at the source code of both repos (the raddle.me repo is called Postmill). There’s no relation at all. Both repos have history going back at least a couple of years. Kbin says in the readme it is inspired - not based on - Postmill. But even if it was, they’re both open source! The whole point of open source is that you can reuse other people’s code to make your own thing!!!