@Psymon --- yes, that phrasing of
COMMERCIAL refers to use in print books and other created works that display a font without allowing access to the font "software". You need to look for the magic words "may be freely distributed" or "may be used on websites" or "may be embedded in e-books". Lots of font-makers say "free for commercial use" and they might even think that includes re-distribution --- I have heard of people who have contacted the maker and got permission to distribute (the maker just didn't know how to properly word their license).
To make sure you are getting a distributable font, try google fonts (almost everything is SIL OFL or CC or GNU license )
https://www.google.com/fonts
Open Font Library is good also, all re-distributable
https://fontlibrary.org/
font squirrel has a great selection, but check every license.