I think the issue would revolve around the effect that the element has.
Back during the period that the antitrust action took place against Microsoft, IE was not only not standards compliant, but it was seriously not compliant, to the degree that a website that looked right in IE didn't work at all for anything else, including those that followed the standard. This meant that it was likely that most sites would look right on IE, but wrong other browsers unless the owners had implemented detection and presentation of separate pages/files for the browsers. It was a deliberate act, adding functions and features that aren't in the standards to break compatibility with other browsers.
Contrast that with the search issue. Different search site/plugin is going to return different results, with different priorities. Google started as a webpage, and got to be the site of choice for search. They work based on content. Search Engine Optimization got to be a thing, and if I recall properly, it's against the rules with Google. Your content should be your content, and it should be relevant, and you shouldn't be stashing a bunch of keywords to push your ranking up. Sites get caught misbehaving, get dropped in ranking until they clean up the fake bullshit they put in to push themselves up.
Not sure that you can really compare deliberately breaking standards and by extension sites, and thus making other browsers not render them properly... with crawling sites and ranking them, and demoting them if they try to fake out the rating system. Google is just doing what it does, search, and there really are other choices. I presume the other search engines do similar in terms of ranking and demotion... or maybe not, if they return a lot of keyword-bait sites at the top.