I have looked into the impact of Stop the Farms (SF) on soil animals. For your result that it decreases 55 broiler-years per $, I estimate it causes 662 billion deaths of soil animals per $ due to decreasing the agricultural land needed to feed broilers. The vast majority of the deaths from soil animals are from soil nematodes, and some of these seem very painful. For a spending on SF of 35 k$/​employee-year, it causes 23.2 quadrillion deaths of soil animals per employee-year.
I have looked into the impact of Stop the Farms (SF) on soil animals. For your result that it decreases 55 broiler-years per $, I estimate it causes 662 billion deaths of soil animals per $ due to decreasing the agricultural land needed to feed broilers. The vast majority of the deaths from soil animals are from soil nematodes, and some of these seem very painful. For a spending on SF of 35 k$/​employee-year, it causes 23.2 quadrillion deaths of soil animals per employee-year.