They got a cease and desist from the publisher [1]. The broad reasons are given in the article, but it's pretty much what you would imagine, IP issues. Also OpenAI seem to have taken down all their blog pages mentioning it without notice.. . Some are archived luckily [2].

I understand that they have to comply with regulations, however I was a bit disappointed that they weren't transparent about it.

[1] https://www.forbes.com/sites/aarontilley/2017/10/04/grand-th...

[2] http://web.archive.org/web/20170111195314/https://openai.com...