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YouTube has found a new way to load ads | AdGuard Blog
(adguard.com)
This is a most excellent place for technology news and articles.
Yeah, I've thought the same. It's like with ads on websites - ads are served from different domains and as blockers work by denying requests to those domains. If they really wanted they could serve the ads from the same domain as the rest of the website. I guess one day they might but so far it must not be worth it.