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last year, the Association of National Advertisers (ANA) published a two-part report finding that 15% of programmatic, open-web advertising dollars went to MFA websites, totaling about $10 billion in ad spend.

A new report found

H&R Block served more than 2,100 impressions to one user on an MFA site within an hour.
…
Comcast paid an effective CPM of $2,628 to reach one consumer on an MFA site.
…
an ad-spend analysis on behalf of a Fortune 500 company and found that in the second half of 2023, it had spent at least $10 million on MFA websites

MFA is made-for-advertising aka junk

via Marketing Brew