why do they call it cohost when you co post in the post co host host the post?

avatar by @citriccenobite
you can say "chimoora" instead of "cow of tailed snake" if you want. its a good pun.
i ramble about aerospace sometimes
I take rocket photos and you can see them @aWildLupi
I have a terminal case of bovine pungiform encephalopathy, the bovine puns are cowmpulsory
they/them/moo where "moo" stands in for "you" or where it's funny, like "how are moo today, Lupi?" or "dancing with mooself"
why do they call it cohost when you co post in the post co host host the post?
many chosters are co posting this
why won't hosts address these chosts?

how much post could a post host chost if a post host could chost posts?