The file costs nothing, and the man who digitised it gave permission to sell work made with it. Whether that settles it is the part nobody can answer, and it is why this site cannot tell you it is safe on something you charge money for, and why the face is not embedded here.
The history is the reason the answer is murky. Morris Fuller Benton cut the original as metal type around 1904, and the file circulating today is a digital revival Dieter Steffmann made from it in the 1990s. Those are two separate pieces of work carrying two separate legal positions, and the revival is the file everybody is actually downloading. Steffmann gave his fonts away for any use, commercial included, but a revival of somebody else's type is only as free as the original, and the Fedora Linux project turned his fonts down over that doubt. The download sites label the file free and, in dafont's own words, call that label just an indication.
In practice: on a personal tattoo, a poster for your own wall or a school project, nobody has ever come after anyone. On a product with a price on it, a client logo or anything you are invoicing for, get a face whose licence is written down. The characters on this page dodge the question completely, because Unicode is a public standard and belongs to nobody, so what you paste carries no licence at all.