If the first thing people ask about your offering is "what programming language did you use when you made this," your offering is probably not that interesting.
If the first thing people ask about your offering is "what programming language did you use when you made this," your offering is probably not that interesting.
The offering in question is "A better GitHub" so you are correct. That is an actual quote from the FAQ [0] by the way.
In comparison CodeBerg [1] and SourceHut [2] both offer Git hosting but don't merely describe themselves as "GitHub but X".
[0] https://gitdot.io/faq
[1] https://codeberg.org/
[2] https://sourcehut.org/
Or maybe your audience is developers who might want to contribute to the project, and would prefer to work in some languages more than others.
If your primary audience is people who want to contribute to it, then the fun of hacking on it is more impactful than the benefit of the offering itself. That's not bad at all! But it also does not suggest that the offering itself is particularly impactful.
Not necessarily. It isn't at all unusual to use something because it is useful and also want to be able to make improvements to it.