Google's ad/tracking code is generally measured in the tens of kilobytes. Compare that to e.g., the tens of megabytes that news sites routinely waste autoplaying videos on completely different stories to the one you clicked on.

Google clearly already knows whether a website is primarily a text-based site or a video-based site, as it displays the two differently in search results. If they immediately blacklisted any text-based site with autoplay video from ever appearing on the first page of search results it would cut about 50% of web bloat overnight.

Yeah they have competing interests when it comes to truly minimising unnecessary resource usage, but there's so much good that they could do without going anywhere near cutting into their own analytics.