[esjeon]

The notebook interface of Mathematica is simply unique. It is based on a Lisp-like language (Wolfram language), and fully exploits everything that Lisp can offer (and Lisp can get weird infinitely). It provides an unmatched level of freedom and versatility to the end-user. Wolfram is clearly the first one who built a end-user interface this much powerful, and nothing literally comes close, even Jupyter.

So, yeah, seeing that Jupyter is being used more broadly than Mathematica, Wolfram should feel uncomfortable. (Also note that Jupyter is officially inspired by Mathematica.)