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YouTube’s ad blocker crackdown now includes third-party apps
(www.theverge.com)
This is a most excellent place for technology news and articles.
I still use FreeTube for desktop and no ads here :)
FreeTube, newpipe etc. simulate being a browser and extract the video that way..if YouTube would want to add ads for this thirdparty clients they would have to inject them directly into the video feed.
With the WebM-Format they use it might be possible. It's based on Matroska and there is a feature to replace or add chunks within the stream in realtime.