Arthur's languages are awesome, no doubt about it. But the fact remains that they are proprietary and prohibitively so. As much as you romanticize k/q, I bet you can't even afford to run it on your home computer, let alone do any real work on it.
K4/Q 32-bit is free for noncommercial use http://kx.com/trialsoftware.php and has been from the day it became generally available. (And before that, k2/k3/ksql were similarly available)
A free / open source K3 interpreter is being developed in https://github.com/kevinlawler/kona , and while incomplete it is already quite capable.
Oh, and Kx are (or at least were) quite reasonable with commercial use licenses for businesses that can't yet afford them.
> Arthur's languages are awesome, no doubt about it.
That is the only true thing you wrote.
IIRC in 2006 they mentioned that they were willing to entertain other financing models (such as equity) if it makes sense, although I have no idea how common that was, or if they are still considering it.
Regardless, the claim that "you can't afford to run it on your home computer" is preposterous - k itself is free for noncommercial use, and kona and J are free, both libre and gratis.