Cool concept but I would never use it. It's an archetypal example of the web being the champion of "worse is better." I am happy with just taking notes in a local text file using a text editor. This is not a complicated problem to solve.
Save notes by copying and pasting the URL? Why not just copy and paste the text itself? I don't need formatting in my notes.
I used to use VSCode for this but then they went and effed it up by adding so much spam to the app. If I happened to have an SSH open connection previously, it just reconnects to that and makes me wait, and then I have to press buttons to get back to a blank local workspace. Or sometimes it like splash up a "We added a bunch of features you didn't need" page. Ugh.
Save notes by copying and pasting the URL? Why not just copy and paste the text itself? I don't need formatting in my notes.