If what was "unethical" was inscribed on stone tablets by God, then that would be a decent position. But I don't want companies deciding for themselves what is

If what was "unethical" was inscribed on stone tablets by God, then that would be a decent position. But I don't want companies deciding for themselves what is unethical; they are not unbiased actors and are incentivized to define "ethical" as whatever makes them the most profit. Do you want companies deciding for themselves that labor/environmental/financial regulations are unethical?