WHO believes the virus came from wildlife farms which supply wet-markets. China apparently shut these down a year ago.
Plausible... could one wild bat cause a pandemic? Maybe, but the odds are long.
But if you farm wild animals, and you get a wild, novel virus loose in what is likely a closely confined population then you could end up supplying large numbers of infected animals to the market.
https://www.npr.org/sections/goatsan...ce-of-pandemic