MacOS Only Thrives when it stands on Decades of free software

Apple was literally on the verge of bankruptcy, until they decided to use the free / open source BSD kernel for MacOSX and switched to a free software base.

Windows NT also utilised a lot of BSD code / open source for their network stack too.

The reality is, the biggest OS systems rely on a lot of Open source code.

If BSD was less permissive, it's likely that MacOS wouldn't still be around, and that Windows NT networking would have been struggling a lot longer