Misinformation/disinformation is a Google problem

[prime]

Measuring the prevalence of (dark) pooling. We measure
the high prevalence of ad inventory pooling by our control
and misinformation websites. By analyzing the ads.txt
and sellers.json files, we identified nearly 80 thousand
instances of pooling. We find that the misinformation pools
are significantly more than twice as likely to pool ad inven-
tory from unrelated websites than those that do not contain a
misinformation website. Upon further analysis of ad-related
metadata in network traffic, we confirmed the use of 297
pools across 38 ad exchanges by misinformation websites.

https://arxiv.org/pdf/2210.06654.pdf