It was removed because author doesn't like people seeing their work.
...author doesnt want to be famous?
It seems so.
Actually, the original work was something that the original author made to sell, so the original isn't free. On the original author's twitter, he's stated that he wasn't credited properly because the name listed isn't the person who made this and it's a doujin that he sells so he isn't being properly supported.
I'm upset too, I didn't get to read the full story either, but it's best to understand the full story from all sides.