On Jan. 8, MediaMath kicked a handful of publishers out of its “curated market,” an exclusive programmatic marketplace that the demand-side platform created last year for more than 7,000 advertisers and 500 publishers to automate the buying and selling of high-end inventory. The reason: Those publishers had failed to upload to their sites an ads.txt file listing which companies were authorized to programmatically sell or resell their inventory.

As ads.txt adoption grows, so too does enforcement
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