No idea on legality, but personally, I find the whole naming around IPython notebook/ Jupyter notebook/Jupyterlab itself to be confusing enough, and if you were

No idea on legality, but personally, I find the whole naming around IPython notebook/ Jupyter notebook/Jupyterlab itself to be confusing enough, and if you were to have an official looking domain like JupyterCloud to redirect to a product called SageMathCloud, I'll just ended up thinking of SageMathCloud as the hosted commercial product of Jupyter, so yeah, it is confusing (and also I find it to be not a very nice/honest thing to do). p.s. Unless you're BuzzFeed, clickbait title that looked like it is looking to stir up drama is just gonna make you look less trustworthy (which is a shame, since the article itself is about a pretty important topic and very much deserves a discussion).