There are blockbuster Steam games which sell tens of millions of copies largely on the strength of an active volunteer modding community keeping them interestin

There are blockbuster Steam games which sell tens of millions of copies largely on the strength of an active volunteer modding community keeping them interesting, and no shortage of OS projects whose founding company profits from selling [derivatives of] that software to people that want paid software licenses. Obviously it's less legitimate if you rugpull access to the existing base game or if your original OS project marketed itself as being always free everywhere...