It's the position of wordpress that all themes and plugins are derivative work https://wordpress.org/about/license/
My understanding is because of the way PHP works all plugins are directly interacting with the wordpress code.
Wordpress does absolutely nothing to enforce this, so their position on the matter is irrelevant.
Commercial plugins are a thing, next.
Wordpress does absolutely nothing to enforce this, so their position on the matter is irrelevant.
Commercial plugins are a thing, next.