The botulism spores are abundant in soil, but they don't get activated unless the conditions are met. The main condition is an environment without oxygen and the presence of proteins, which happen both in sealed oil-garlic containers.
> The main condition is an environment without oxygen and the presence of proteins, which happen both in sealed oil-garlic containers.
This seems such a general condition... in first approximation, sealed containers with anything at home are sealed containers with proteins...