@signalapp
In the article that broke this story, #JeffreyGoldberg called #Signal a "commercial" messaging app.
https://archive.is/F9FSe
And as far as I can tell, most of the media are following his lead on that.
But Signal is #OpenSource, developed and managed by the #nonprofit Signal Foundation. I'd call that non-commercial or barely commercial. I think Goldberg and other journalists mean "non-governmental" or "private sector".
Small point in the big picture. But it's not as if Signal is profiting from the govt business or even the publicity.