This is a very uncommon idea within EA. There are some people who support it ("patient philanthropy") but almost everyone within EA either thinks you should be working / donating to help people/animals (most "neartermists") or you should be working / donating to help reduce extinction risk (most "longtermists").
Are they? To what degree are they? And to what degree are they not helping the hungry today, in order to amass more money so that they can in theory help the hungry more tomorrow?
I can respect someone like Bill Gates. He hasn't been perfect, not by a long shot, but he's put real money into really trying to help real problems. What's the track record of the effective altruists? (Genuine question - I haven't researched them enough to know.)