Google could restrict the content loaded in AdSense iframes and apply AMP restrictions to ad content only. They also have the means to limit the number of ads partners can load on a page, and restrict the overzealous use of Google Tag Manager which slows down sites.

Google offers both the poison and the antidote, and each of their solutions, see what they're doing with request blocking in Chrome, happens to erode user liberties and privacy rights to concentrate power around Google properties.