If you really want to get into the weeds, typefaces are fundamentally exempt from copyright protection in the US (Eltra Corp. v. Ringer), and the only reason that font files (and the like) have any protection is that the font is considered software which requires a de minimus creative effort to implement a particular typeface.
Last I checked, they’re eligible for copyright directly in the U.K. and I still need to check what their status is here in Canada.
That aside, I’m already bending the rules as far as I’m willing to in allowing stuff on my list that says “public domain” when places like Germany don’t recognize that without a fallback like the CC0 offers.