I wholeheartedly agree, and think we need to look elsewhere to apply this model.
Donor Lotteries unhealthily exhibit winner-take-all dynamics, centralizing rather than distributing power. If this individual makes a bad decision, then the impact of that money evaporates—it’s a very risky proposition.
A more robust solution would be to proportionally distribute the funds to everyone who joins, based on the amount they put in. This would democratize funding ability throughout the EA ecosystem and lead to a much healthier funding ecosystem.
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.