All my PCs run open source OSs and this really isn’t true. The GNU/Linux landscape has changed wildly in the last 5 or so years. You’re only slightly less beholden to the people that maintain your OS than with proprietary systems because you still have to update eventually. A lot of BSDs are still roughly the same but being OSS doesn’t necessarily imply you’re free of change.

- you can update whenever you want (or not do it ever) - you can modify any part of the OS, no restrictions - you can run any program you like: signed, unsigned, app-store, not app-store, etc.

==> the differences are there between OSX and GNU/LINUX