Comment by latexr

Because it’s a wrapper on a closed-source system.

Imagine writing a shell script that cuts and converts video by calling ffmpeg, would you say it was “a video converter written in bash”? No, the important part would not be in bash, that’s just the thin wrapper used to call the tool and could be in any language. Meaning it would be useless to anyone who e.g. worked on a constrained system where they are not allowed to install any binaries.

Same thing here. If you only run open-source software for privacy reasons, sending all your program data to some closed server you don’t control doesn’t address your issue. There’s no meaningful difference between making an open-source plugin that calls an OpenAI API and one that calls a Grammarly API.