I just had a very long conversation about co-host insurance from Clark from Airbnb about whether or not co-hosts are covered by the Host Protection Insurance. He said that there is nothing definitive in the policy that ensures co-hosts are covered. He said "he believes Airbnb would make sure not to leave a co-host high and dry if they were to be sued" but he was very clear that he could not officially confirm that fact.
If co-hosts are not covered by the Host Insurance Protection Insurance, then this means that if a guest sues a co-host as a result of injury or some other issue that occurred during the Airbnb stay, the co-host would be left to fight the suit and potentially pay large damages with no insurance coverage from Airbnb.
This is a very big issue and will discourage me from co-hosting and I imagine will discourage others. I was hoping to get others' opinions and hopefully get some clarification from Airbnb. If the intent is for co-hosts to be covered, then I think it should be made explicit.