According to what I can determine, profont was blacklisted some time in 2012 or earlier for having unclear licensing.
That reference being:
https://labs.parabola.nu/issues/181

The profont developer's blog lists that this font is now licensed under listed as MIT as of 2014.

"After the license situation had been unclear for a few years, ProFont now is published using the MIT license, allowing you to copy and modify ProFont without limitation (see included LICENSE file for more information)."
http://tobiasjung.name/profont/
https://opensource.org/licenses/mit-license.php

The FSF license list and a diff indicates the license is actually Expat.
https://directory.fsf.org/wiki/License:Expat