@Suiseiseki >Ambiguity if the license is GPLv3-only or GPLv3-or-later as it doesn't say which one.
>Licenses : GPL-3.0-only

>No license headers in files, meaning it is not clear if it is free software.
I dunno man, I think it's pretty straightforward that a licence on a repo applies to everything in it unless noted otherwise. I don't think that's a leap of logic at all.