You can't copyright a font.
Maybe not in the US, but fonts do enjoy copyright protection in at least some European markets.[1] I frequently encountered this campaign on DVDs for rent in the local Blockbuster equivalents, so I don't think it is entirely theoretical infringement, either.
[1] https://en.wikipedia.org/wiki/Intellectual_property_protecti... and forward
FACT/FAST are a UK organisation, where font copyright is espressly enumerated in the copyright law.
"You wouldn't copyright a font"
You can copyright just about anything as long as you have the _money_
T-Mobile trademarked a very specific pink, "Magenta"
There’s even a company that holds trademarks on a set of colors, Pantone.
Courts have yet to reverse or revoke these silly trademarks.
A typeface design, in the U.S., no, but the digital font file comprising outline data and instructions, according to current U.S. law, for an overview of current case law and a proposal see:
https://digitalcommons.law.scu.edu/chtlj/vol10/iss1/5/