"But don't pretend to be free speech defenders"

This is 100% consistent with being a free speech defender. Free speech defenders' position is that speech you don't like should not be fought by censorship, but should instead be fought by speech you do like, which is what what they're funding.

"It makes me feel like the margins are too high all around"

We don't know how the finances work out, for all we know, they take a loss on these accounts when their full effort to handle payment to charities is taken into account.