Prices for ads is very poor on twitch. The claim was that amouranth made "just" some ten thousand income with ads, which considering how many viewers she has is not that high. The majority of direct income on twitch comes from donations and subs. The bigger income comes indirectly from placements and cooperations outside of twitch, which of course are not part of the leak.

Twitch is not YouTube. For some reason they had for a long time big problems to get their ad-business running, especially outside the USA. It seems because of this the payment is low for streamers.