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![](https://fry.gs/pictrs/image/c6832070-8625-4688-b9e5-5d519541e092.png)
Here’s an image viewer example with 0 exposed HTML elements (all UI rendered through a single canvas) and 0 human readable code (all client side code compiled to webassembly bytecode). Trying to block unwanted content in this kind of site would be closer to cracking a video game or patching an android app.
AFAIK there is no need to re-encode, since Youtube videos are stored and served in chunks anyways. The change is that they are now slipping in the ad chunks as if they were a part of the normal video chunk stream.