Big companies have resources to mimic it anyway, right? If they really want some tech, they can reproduce it.

Having a good idea flourish, whether it is in Microsoft's hands, manifested within Clojure, or in any other fruitful form, is good enough.

There is no license for a raw idea anyway. For the essence of it. Seeing it used means success, it means "you were right".

The secret counsel of idea honor keepers will eventually figure it out and make some kind of repairs.

Since the terms of the license were violated, there's not much to learn about which license was chosen. The only lesson to learn is that big tech will steal everything that isn't nailed to the ground, and then some.