One advantage of Google's dominance and their business model being so reliant on tracking, is that it's become the moat for its competitors: investing energy into tracking protection is a good way for them to gain a competitive advantage over Google, since it's a feature that Google will not be able to copy. So as long as Google's competitors remain in business, we'll probably at least have some alternatives that tak…
That's a very interesting point. But tracking-free services won't really have a major mindshare with the general public because you really can't compete with "free." And there's nothing preventing Google from leveraging Youtube/Gmail/Search to push out other browsers which have tracking protection. Youtube already plays less well with Firefox. Gmail isn't exactly snappy on Safari either.
In most other cases I could agree there may have been nefarious intent, but as someone who's followed web components for a while I think YouTube just made a bad technology bet -- that being rewriting their front-end in Polymer v1, which was based on Web Components v0. Jumping the gun on an unratified standard is risky, and this example shows why.