I also suspect that the evaluation mechanism is going to be very important. I can think of philosophical debates whose resolution could change the impact of an “artifact” by many orders of magnitude. If possible I think it could be good to have several different metrics (corresponding to different objective functions) by which to grade these artifacts. That way you can give donors different scores depending on which metrics you want to look at. For example, you might want different scores for x-risk minimization, s-risk minimization, etc. That still leaves the “[optimize for (early, reliable) evidence of impact] != [optimize for impact]” issue open, of course.
I also suspect that the evaluation mechanism is going to be very important. I can think of philosophical debates whose resolution could change the impact of an “artifact” by many orders of magnitude. If possible I think it could be good to have several different metrics (corresponding to different objective functions) by which to grade these artifacts. That way you can give donors different scores depending on which metrics you want to look at. For example, you might want different scores for x-risk minimization, s-risk minimization, etc. That still leaves the “[optimize for (early, reliable) evidence of impact] != [optimize for impact]” issue open, of course.