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Can, but they don't, because app developers are just as lazy and don't waste time to hide their trackers

They don’t because there is no reason to currently. If this was added then they would have a reason to and do it.

YouTube used to be separate domains for ads and then it got merged together so that you can’t block the ads network wide without blocking YouTube videos.

That's YouTube. One of the unlaziest dev teams. Spiderman Solitaire isn't going to bother.

Yet.

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