It's pretty instinctive to name stuff like this, especially when it's not a general purpose solution like you're not downloading this for any other reason except to build upon what Mermaid does.
They could have called it something entirely different, and then they can say (vscode plugin for mermaid.js) every time they mention their unique name that carries no association with it.
And Mermaid could have decided they want exclusive use of the name and trademarked it half a decade ago.
They could have called it something entirely different, and then they can say (vscode plugin for mermaid.js) every time they mention their unique name that carries no association with it.
And Mermaid could have decided they want exclusive use of the name and trademarked it half a decade ago.
So it's just fair use, isn't it?