[vSanjo]

This isn't my area so I'm going off cobbled together knowledge.

Surely Youtube being the size it is has a few Github issues against it saying 'I can't load images because I block the ads'?

I guess what I'm saying is, what is the negative impact of your first point? That some content you want won't come through because the content you don't comes from the same domain?

[michaelt]

What HugoDaniel is saying is: PiHole won't let you watch Youtube ad-free. To do this you need an ad-blocking browser extension like uBlock Origin.

This is because Youtube serves content and ads from the same domain, so you can't domain-block ad content without blocking all content.