Nowadays I'd probably just ask Claude to figure it out for me, but pre LLMs, WL was the highest value tool for thought in my toolbox.
(Edit: and they actually offer perpetual licenses!)
If this was open sourced, it had the potential to severely change the software/IT industry. As an expensive proprietary software however, it is deemed to stay a niche product mainly for academia.
Ugly os software at least has potential to grow internally. Long lived commercial software is a totting carcass with fresh coat of paint every now and then.
Someone has to pay the bills for development effort, and when it based on volunteer work, it is mostly followers and not innovators.
In many cases, people are free to write their own implementation. Your claim "Source code should enter public domain in a decade at most." means that every software vendor shall be obliged after some time to hand out their source code, which is something very strong to ask for.
What is the true crime are the laws that in some cases make such an own implementation illegal (software patents, probitions of reverse-engineering, ...).