Just to draw more attention to the point, it's not an unrelated project simply "using the Mermaid name," it's a for profit project started by the creator of mermaid.js, which charges for some advanced tooling around the opens source project. It's a common enough paradigm to see and in my opinion a pretty virtuous way to fund open source development.

See also Redis labs, Gitlab, ElasticSearch...

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.

So it's just fair use, isn't it?

Love mermaid. And for me mermaidchart.com was synonymous with mermaid markup. Thank you very much! I didn’t know the official website of the project is https://mermaid.js.org/ Just learned from you.