I fear there’s a bit of wishful thinking interspersed here.
‘Open Source’ is a term, that means, that the Source code is accessible, but tells you nothing about the liberties that the license grants. There are plenty of proprietary projects that are Open Source in that sense, but with non-free licensing. That might not be how the term was initially used, but that’s just how it is now.
The term FOSS exists specifically to distinguish it from that.




Someone trying to argue the correct term for something, but than grossly misusing the term ‘manspreading’ is exactly my kind of humor.