Isn't that what they predominantly use? I don't think I've ever seen an LLM use an em-dash without spaces. I've never seen an en-dash with spaces, but have seen them in ranges.
I checked a message from my last chat with Claude
> Noted for this conversation — though worth flagging
I checked a message from my last chat with Claude
> Noted for this conversation — though worth flagging
and that's an em-dash (unicode 0x2014)