This is kind of an alien and strange notion - that of updating IF games, rather than interpreters.
text-adventures predate all that open-source jazz, even though has about the same origins: that famed 70s AI lab ran by Adventure-playing and Lisp inventor John McCarthy and that housed both the Infocom founders as students and Richard Stallman, the free software revolutionaire.
Up until quite recently, an author would compile the game source into a game file, then release it, and perhaps polish it later due to feedback. And that’s about it. But we’re living an age of software as service, of DLCs, of microtransactions… text-adventures sound more old than ever besides being all text… not that I think these trends are any good.
I believe Kerkerkruip and Counterfeit Monkey have their sources open to anyone, so anyone can study and modify it. But this is not software for a pragmatic purpose, it’s an art artifact of sorts. I’m more interested in the authorial input rather than that of some editor.
In any case, bug fixing is good, can’t argue with that…