[Tabular-Iceberg]

If ad blockers go by URLs, why don’t advertisers simply serve ads from the same domain with a path masquerading as content?

[extraduder_ire]

Youtube (and IIRC adobe) ads work like that. Either from the same domain, or a subdomain.

ublock origin has a "DNS unmasking" feature in firefox that defeats this. I think there's a less effective workaround used for other browsers.

[gkbrk]

They don't trust the websites not to tamper with stuff.

[Tabular-Iceberg]

That makes sense, they wouldn’t be able to reliably collect metrics.