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Can’t you run draw.io locally, though?

On windows, yes. Linux, no.

There's a VS Code extension to view and edit them. Perhaps that works on Linux?

They've had an Electron version out for at least a year now. I use it every day on Ubuntu.

https://github.com/jgraph/drawio-desktop

That can't be right, I use draw.io on my mint laptop, from https://github.com/jgraph/drawio-desktop/releases

Good point. If this is a big concern, I'm happy to enable data export as JSON. Of course, you'd still need a visualiser that can read the data structure and display appropriate icons, but at least you'd have the raw data.

They changed name, but other than that, they never hooded your data (to my knowledge)

I still use it