Wasn't SARS-CoV-1 from a wildlife market, not a farming operation? Factory farming wasn't the issue there if it was from trapping in the wild, but maybe cramped conditions before sale made it spread more amongst the confined animals in a similar way?
When SARS broke out in 2002 the first case was an animal handler on a medium size farm in Foshan, 50 miles upriver from Hong Kong. Our best guess is that the domesticated animals were infected by wild rodents. The initial spread of the SARS virus infected farm workers, butcher shop workers, grocery store workers, and people at farmers markets.
I don't like the name, but "bush meat" is also a common vector for past infections. I believe HIV was thought to have transferred to humans via non-farmed simian blood.
It's fairly likely that covid was from the large coronavirus research lab just down the road that was experimenting on making coronaviruses more transmissible to humans
During the first month of the covid-19 outbreak, there were no cases within a 15 mile radius of the WIV lab south of the river. Zero. All the people infected had been within 200 meters of the wet market north of the river. Wuhan imports food animals from all over southeast asia and animals from Laos are known to carry the BANAL coronavirus which looks like it's an ancestor of sars-cov-2. Also, the WIV did not perform any gain-of-function experiments during 2019/2020; the people who would have done that were working on other projects.
