This seems relevant to any intervention premised on “it’s good to reduce the amount of net-negative lives lived.”
If factory-farmed chickens have lives that aren’t worth living, then one might support an intervention that reduces the number of factory-farmed chickens, even if it doesn’t improve the lives of any chickens that do come to exist. (It seems to me this would be the primary effect of boycotts, for instance, although I don’t know empirically how true that is.)
I agree that this is irrelevant to interventions that just seek to improve conditions for animals, rather than changing the number of animals that exist. Those seem equally good regardless of where the zero point is.
Nick Bostrom’s website now lists him as “Principal Researcher, Macrostrategy Research Initiative.”
Doesn’t seem like they have a website yet.