Just as influenza in the west is usually transfer from birds via poop or saliva to livestock (via the bird dropping food or pooping into feed or water) which infects the livestock, and then the extreme frequency of interactions of ranchers or farmers with the livestock (during feeding, slaughter, etc.) results in the transfer to humans.
LIkewise a bat likely pooped or dropped food into the feed troughs or water troughs of an 'exotic animal' farm and the similar high rate of interaction with farmers/ranchers resulted in COVID transfer.
It is those extremely high rates of human animal interactions that provide an opportunity for exposure to enough mutation variants that a tranfer to humans can occur.
The number of interactions of a worker with an infected sample in a lab in such a way that they could inhale or transfer hand to mouth are so extremely low that the 'escape from research facility' theory is rather absurd.