If they just use the api to create the plugins, no. (It's like Google vs oracle and the java API)
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.
alt Hacker News
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.