You Seem to Assume that the language in question and the API’s must have identical license requirements. Sure, if someone write a novel in English they can get a copyright on the book but not the language. But If I invent a different language and publish it in a book, why should I lose the rights to it simply because of what the language is or how people would use it. You can’t copyright the European history because it’s facts, but you definitely can hold a copyright to the Written. history of Westeros.
Also, just to note. Even authors of completely proprietary languages want people to use them. Only they also want to make money when people use term. The intention that people should use your product does not give anyone rights to copy outside of license allowances or to break copyright where that applies.
Also, just to note. Even authors of completely proprietary languages want people to use them. Only they also want to make money when people use term. The intention that people should use your product does not give anyone rights to copy outside of license allowances or to break copyright where that applies.