Unbeknownst to me, at the end of November 2022 it was banned due to being "used for spam". I discovered this on December 17th and promptly submitted an appeal. I have since submitted another appeal, on January 31st (today).

Suffice it to say, there has never been any actual spam on r/scriptbin. The only thing that was ever there was updates on scriptbin's development. As any independent site, Reddit is free to set their own tentpoles for what to host, but I don't think there exists a characterization of "spam" that is both sufficient to cover what r/scriptbin contained and that also overlaps with reasonable people's definition of "spam".

For more information, see this post on r/GWABackstage.