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 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.
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/