A font file is more like a config that’s used by your OS to render something, there’s no real interactivity in fonts (except some ligatures but those are just static tables, right?).
I would say that counts as interactivity.
Fonts aren't software in any meaningful sense of the word.
In the United States, it is settled precedent that typefaces are not copyrightable. That doesn't change just because they became digital in 1984.