There is some work going on to remove Javascript, but it is slow going. Most publishers won't trade off revenue for performance and security so there is no incentive for the buyers to change their ways.
Giving publishers a choice would be a start. A checkbox 'Allow JavaScript' for AdSense publishers and a way to run revenue experiments about JS on/off.
That does raise the question is Google big/ubiquitous enough to force that on publishers? If Google unilaterally decided no more JS in ads., would the publishers grumble about it but adapt, or would they look to other ad networks.
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