I doubt very much that when Sony uses that forked clang compiler, where they only upstream non-PS4 specific optimizations there is any user right to care about.
In this case Sony is the user and they care very much that they can freely change the compiler as needed without having to ask someone else for permission. Price is a secondary consideration here.
Benefits of strong copyleft or BSD-style copyright is another matter of discussion.
- warez: piracy (or copyright infringement if not on the sea)
- open source: cares about user's rights, not price.
- "4 free": freeware. Does not care about rights, only price.
Relatedly, you are very much encouraged to sell free software https://www.gnu.org/philosophy/selling.en.html and free speech does not mean cellphone contracts with voice for $0/month.