The same question about JS repos struck me. I suspect that if you write a shared letter then you just ask your network to sign it instead of <random other person from different ecosystem>, but I would be curious to know if these grievances are disproportionate in different communities.
I'd like to think that someone who writes this kind of letter would take such a thing into account. It's really possible that there is a strong correlation between a language and people being more involved with Github. I wouldn't be surprised that many developers from other language ecosystems just don't care.
