Most hosts look for co-hosts with extensive experience of being a host, where they can check out their reviews and ratings. Being a guest at an Airbnb doesn't mean you know how to set up and optimise a listing, how STR legislation works in your area, how to vet guests, to make a successful claim when there is guest damage to give just a few examples, or the in and outs of how Airbnb works @Yahaira10
It takes time and experience to understand this.
If you want to get into co-hosting start by hosting yourself or get some experience working an Airbnb property management company.