I haven’t come across a FOSS scanner app that comes close to the performance abd features of the popular closed source ones. That’s why I use closed source ones that still work when I deny them internet access. Genius Scan and Microsoft Lens both work that way.
That’s the thing. They don’t make their camera app available to third party ROMs despite officially cooperating with one, and they also haven’t made the camera’s features available to third party camera apps. So for me, being on CalyxOS myself, that announcement email read like a joke.