First, you can read about Sam Bankman-Fried; then you can say "oh, he's not _real_ effective altrusim...and do your backflips.
Is that the standard you hold everything to?
According to AI, the biggest EA charity is GiveWell, which spends about 600 million per year. 95% of the money on low-cost high-impact global health programs like mosquito Nets and vitamins for children.
There is also open philanthropy, which gives about 500 million per year With a wider perspective. Roughly 50, 40 and 10% go to Global Health, Existential Risks, and then Animal Welfare in that order.
That said, I'm not really trying to argue the case. If the simple reason is that people have characterized EA based on SBF, and that's how they think about these things, then that is a complete answer.
Now, questions:
In your view (which I will listen to, because you're actually an EA), is the "wait until later to be more effective" actually a part of EA? Or is that a separate thing that calls itself by the same label?
If it's the same thing, it sounds like you don't act that way. Do you not buy the "later" logic? If not, why not?