YouTube has a thousand to a million times more copyrighted content than Megaupload ever had. And no, not all of it is via partnerships with the copyright holders. Kim's problem apparently was that he didn't bribe Congress.
YouTube didn't bribe congress. They built significant tooling that gave the rights holders what they wanted, even beyond what the law required them to. https://en.wikipedia.org/wiki/Viacom_International_Inc._v._Y... . To this day, rights-holders don't even have to take legal action or issue a formal DMCA takedown to have videos taken down or siphon off the profits of those who use their content. It is even automated.
> “[T]he obedient US colony in the South Pacific just decided to extradite me for what users uploaded to Megaupload, unsolicited, and what copyright holders were able to remove with direct delete access instantly and without question.”