Ars Technica is on my shitlist because they chose to make their site content shift around as you scroll, to make way for ads or email lists or whatever. I don't know why devs and designers at these companies don't fix this.
Because they are not in charge.
The product/ad/business team could "fix" this, and then what would happen is they'd layoff some folks (usually editorial side) a few months later as the revenue drop hits home.