alt Hacker NewsC and C++ were closed source for quite some time, they still are in places like commercial embedded OSes and console dev kits, even when they happen to be GCC and clang forks nowadays.
Clang actually has replaced most GCC forks exactly because vendors can keep the fork closed source.
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jibal • yesterday at 7:34 PM
The C compiler source came with the AT&T UNIX tape ... it wasn't open source because FOSS didn't exist at the time and it was under a proprietary license, but it was not "closed source". Parts of MOJO, OTOH, are closed source because the source has not been released (yet ... it apparently will be later this month).
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Sure but at those times C and C++ had no immediate replacement, and if you were doing embedded C/C++ was your only option. The same cannot be said for Mojo.