If I understand this proposal correctly, this is exactly to prevent such things. Yes, of course, it’s to prevent people from using ad block. But a nice side-effect is to block crawlers, or frameworks like selenium as well, so they can „serve ads only to real people“. Of course, people will always find a way to crawl. We already have bot farms that are just remote controlled smartphones lined up somewhere. But it makes it harder for everyone who isn’t Google to compete with Google.