In short, Effective Altruism says you don't engage in charity until you have sufficient means to actually make a difference. Basically, you leverage capitalism to accumulate enough wealth to actually be able to solve a big problem, then you go all in on solving that problem. Sounds great right?
In the real world these people never accumulate enough wealth to actually start solving problems. Even when they become billionaires. In practice it is a convenient excuse to act like the most depraved capitalist while still pretending to sit on the high horse and talk down to people who simply try to help with the means available to them.