macOS is based off FreeBSD, which is completely free. Not sure what you mean here. I don't really see much documentation that shows GNU made Linus use GPL or not. You can't assert that.
Being dedicated to software freedom doesn't exclude you from being idealistic. They propose solutions that would require good sacrifices that many greedy people simply won't follow. If you really think the status quo is "idealistic" then you don't know what that word means. Computer science is already very much in the public consciousness and corporations have already been exposed, but they still operate. It's idealistic to think they would sacrifice their greed. Despite how much software the FSF have funded, they're still unable to attack.
Linux is a practical response to non-freedom. "sell out", "liberated", "changed his license" is all just word choice. There is still a long gap between open-source and proprietary. Nobody should co-opt words, including that "open-source" shouldn't be redefined to libre software. You can argue that any promotional stuff, including FSF, is propaganda being blasted to you 24/7. Yes, these are very awful, but we need workable alternatives that can do many of the same stuff to switch to before we can rejoin freedom.