Several years ago, I ran a niche hobbyist website and incorporated Adsense (because why not?!?). The site featured a fuzzy search function since it referenced tens of thousands of named parts. The search result page would echo the (sanitized) search term followed by the matching results - along with recent search terms in the right sidebar.
One day, some spambot hit the site and started searching for terms like "mesothelioma". Adsense would see that page with "mesothelioma" in the sidebar, query for it, and served up the ambulance chaser's paid ads, even though there obviously were no matching results.
I didn't realize this was happening for several weeks since this low volume site was earning very little and I never even hit the minimum withdrawal limit. Suddenly I was earning $50 - $100 - per day. This lasted for a few weeks but before I could transfer the earnings, Google locked the AdSense account due to abuse. It might surprise you, but Google support was not helpful and after a series of reviews, they permanently shut down Adsense for this site.
Therefore, I also turned off Google Adsense for my websites.
It's been like 10 years since I worked in the space but I'm pretty sure showing adsense on search results like that has been against the tos for a very long time unless you get a specific search feed(which is basically impossible these days and even 15 years ago was limited to companies like ask.com)
I think there is a super-sophisticated industry where advertisers are gamed out of their advertising dollars, and we occasionally can see it leaking out. For example I was very recently relentlessly hammered by political advertising by some odious tech guy who wants to get nominated for some congressional seat in the Bay Area. This was hard programming, where they just threw out the guy's name before you could hit mute, figuring that ppl would do that as quick as they could because the guy's vibe was so unrelatable. I have to imagine that the seasoned ad folks saw this dude as a pay day that they'd milk for all he is worth with this utterly misery inducing campaign. It's almost 100% brainwashing, with the tiniest sprinkle of substance. It has to be an industry that's preying on the buyer as much as the consumer.
Every person and company I know who had an Adsense account was banned and not paid. Two of them were banned for terms violations which were things Google reps told them to do. Endless conspiracy theories on this, no idea.
Interesting "DoS" attack.
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I was dumb enough when I was 11 to sign up for Adsense under my Mom’s name and put it on a php-based meme sharing site I made that my fellow 5th graders used.
Anyway, I noticed I could make a couple dollars a week. So I had my friends sit there and spam load the site. Made about 80$ until Google banned me (my mom) for life from Adsense