I like your use case for your blog. I dabbled with something similar last month: I have had a sci-fi mini-book that I have been slowly writing for a long time. I tried using their text completion API on long snippets of my own prose. I got some interesting ideas. If I end up using ideas and generated text, I have no idea how to license the book, probably some form of Creative Commons license (I was the featured Creative Commoner about 20 years ago, BTW, and use one of their licenses for my AI related books). To be fair, the Copyright would belong to me and everyone who contributed any text in the web that the model was trained on. I wonder what Laurence Lessig’s take on this will be.

EDIT: I just asked Lessig on Twitter what his opinion is on this.