What I don't understand is how it's possible to be the number one ad for the search term "youtube.com" ? You would think that Google would ALWAYS be first in that case.
Presumably though, since it's paying itself, Google can afford to outbid anyone on any ad term on their network.
It's actually a little surprising they allow ads on the term at all, actually. For instance, while "Windows support" results are filled with malicious ads at the top, Google has no ads whatsoever for search terms like "Chromebook support". Google actively disables advertising on terms that help their business, and Google does not seem to discourage malware sites on terms that predominantly affect Windows users, for instance.