Usually, what makes a #programming language special to a #programmer is not syntax, semantics, paradigm, tooling, ecosystem, performance, the big idea, nor other factors that are frequently touted by the language designers.
The programmer—the user of a language—adores it, because it suits a majority of his daily "needs" and, as such, he became "proficient" in it in due course.
In that sense, the notion of a #GPL is somewhat malleable; every language is essentially a #DSL to someone, somewhere, at some moment.