I'm not discounting the possibility, but do consider that the OG one (SARS) also came from wet markets, as well as the 2013 avian flu. China was blasted for allowing wet markets, and so they banned wet markets but secretly started allowing them when the public outcry died down and then we have another one with covid. Also remember that coronaviruses account for 15% of the common cold so it was really just a matter of time.