That intuition seems to me to follow from the probably false assumption that if behavior X would, under some circumstances, be utility maximizing, it is also likely to be utility maximizing to fund a non-profit to engage in behavior X. SIAI isn't a "do what seems to us to maximize expected utility" organization because such vague goals don't make for a good organizational culture. Organizing and funding research into FAI and research inputs into FAI, plus doing normal non-profit fund-raising and outreach, that's a feasible non-profit directive.