I wonder if the ad market will start to drop out for other stuff like websites too. AI might cannibalize search engine traffic... if google can basically scrape your site and then front-run you in the search results with an AI summary, you might not be able to make some money off the content you produce with online ads. Some will say good riddance to the SEO spam type of websites that are stuffed with horrible ads, but there are also people making legitimately good or well intentioned content that live off ad spend. I know I personally enjoy reading certain web comics that seem to be largely funded with online ads. I certainly don't like ads, but sometimes I'd rather see something for free with an ad instead of paying for it.
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On a different note, I sometimes use Instagram and recently I have seen a ton of ads for a local tech event... but the event already passed a good while ago, so every time I see the ad it's completely pointless. Someone out there is getting screwed on their ad spend. I think a lot of companies are probably losing money on bad metrics reported for ad views, ads shown to the wrong audience, fake clicks, etc. I'm not saying ads are completely worthless or can't drive sales and conversions but I do think it's easy to get fooled into thinking they are doing more than they are.