Evidently you don't know how ads work, I'm fairly certain they don't use adsense BUT, people pay them a massive amount for ads. I'm not 100% sure how the payments work because I don't know what type of advertising they're doing and how much it costs.
But, with adsense on even a somewhat dead website 15ish people (Knowing from experience) you can make $25~ a week. I currently run a website that has maybe 30 posts a day, and get 4 ad clicks a day. I've made $22 this week.
Since Sythe PROBABLY uses ads that people pay for monthly (instead of page views / clicks) ^ I think.
They'd be paid probably around $300~ monthly by EACH ad only because of the amount of page views & clicks the ad's get.
If ALL donators turned them off, that would be a MASSIVE drop in page views / clicks for the ads. Meaning people wouldn't pay as much for the ad spots, in the end making Sythe not gain as much money as they could.
I see no reason for them to implement this as ads do absolutely no harm to anyone. Sythe would be losing a lot of potential money if they approve this suggestion.
This would be a good way for Sythe to lose a lot of potential money, everyone who agrees with approving this suggestion needs to look more into it.
Edit @ your edit: That's for adsense, I don't believe they use adsense. I'm pretty sure people just pay them monthly for their ads. If they didn't get as many page views (Meaning people actually seeing the ads) / clicks on the ads people would not waste their money advertising on Sythe.