€0.02
I used Colaboratory a little bit recently. While I like me a good REPL a lot, and really want live programming to inform our dev experience, I think I quickly found the whole Jupyter thing to be a bit of a giant horrific ux train wreck, even if the tracks had been laid with good intention. I guess worse is better, or the adage about one eye, or something.
Thus for me anything that is sort of like Jupyter doesn't start off on a good foot. :-/ And it depresses me if the jupyter meme is somehow contagious.
(I have only mostly watched demos of Eve, never really used it.)