I cannot really follow your first sentence.
It's a double-negative. That meant exactly what you said: copyleft. GPL is not free as in FreeBSD or Apache licences. It is open source, no "quasi" about it (if anything, it's more like the opposite of quasi).
I am not quite sure about your
myself:Subsurface is GPL 2.0 (except some parts it uses like EXIF parsing which comes with a different open source license) which is quasi by definition open source
- are you saying is GPL 2.0 is "seemingly apparently but not really" open source? Does RMS know?
- or that "other" licenses involved are "partly or almost" open source?
- or you are using a definition of "quasi" that I am not familiar with?