There is plenty of source-available software, and I'd suggest your perception to the contrary might have more to do with thinking in the limited terms I describ

There is plenty of source-available software, and I'd suggest your perception to the contrary might have more to do with thinking in the limited terms I described. For a recent example, isn't all software using the Commons Clause source-available, as I define it? The reason there isn't much in the public-domain, closed-source quadrant is that permission without code is completely useless. For example: I hereby grant you, m1el, an MIT license for the short novelty program I have just fixed in the tangible medium of expression know as my hard drive, project name Caveman. Enjoy! Compare code without permission, which still has some limited value for others, especially educational and inspection value, as well as for the developers, in the form of access to free services. I'd also put a number of public-patent-grant programs in that family. That's potentially much more interesting.