- expose existing cattle/chicken abuse in farms and slaughterhouses [...]
Yet I know of no effective animal altruists who spend majority of their efforts figuring out and working on the task which is likely to provide the greatest payoff.
Note that one of Animal Charity Evaluators' two top charities is Mercy for Animals, which has a track record of exposing abuse.
Yeah, I agree, abuse exposure is actually happening, which is good. At least it reduces the unnecessary torture, if not the amount of slaughter for food.
I'm currently unconvinced either way on this matter. However, enough arguments have been raised that I think this is worth the time of every reader to think a good deal about.
http://nothingismere.com/2014/11/12/inhuman-altruism-inferential-gap-or-motivational-gap/