Earlier quoted context omitted.
The Red language[1] was created exactly for the reason that REBOL was never open-source. Red looks like it's still in active development, and "heavily inspired by REBOL." [1] http://www.red-lang.org/
It may be the case that Red was created for the reason you state, but it simply doesn't appear to have the necessary momentum. And that's unfortunate, because REBOL does not have a lot of interesting and smart features, such as having mini-DSLs ("dialects") for things like GUIs. To date, Red can't even run without already having REBOL installed on your system. The project has been around for almost two years now, and…
The announcement this week about "print 1" is about the fact that now the "Red" (higher, rebol-like level) language is also at the brink of working.