Can't copyright an inferred artifact ;)
The problem is that the software is not free software, but encourages you to stop using its free predecessors and competition sneakily.
Also, I second the question about free predecessors/competition, not to argue or compare, but out of pure curiosity.
What do you define as free software? This software is open source, always free as in beer, and free as in freedom for research and evaluation purposes (and seems fairly permissive to researchers…)
You didn’t answer the question - how is this sneaky, and how does it prevent using previous projects?
One example from 1971: https://www.google.com/books/edition/United_States_Code/3j2P...
There are also other (quite valid) authorities on software licensing other than OSI which have differing opinions on which licenses specifically qualify.
For example: most people would probably agree that BSD was open source, despite OSI's lack of approval on its original license. And I hardly think thats 'harmful' in any way.
“in nearly all cases, open source software is considered "commercial software" by U.S. law, the FAR, and the DFARS. DFARS 252.227-7014 specifically defines "commercial computer software" in a way that includes nearly all OSS”
https://dodcio.defense.gov/open-source-software-faq/#Q:_Is_o...
There is no “correct” definition of the term “open source”. People use it to mean many things. If it has any license other than “public domain”, then it limits some freedoms in some ways.
You still didn’t back up your claims: what is sneaky, what predecessor does this license prevent use of?