A major problem with this is that those matching uploads are not necessarily pirated uploads, but the whole system is biased to think they are. NASA has gotten

A major problem with this is that those matching uploads are not necessarily pirated uploads, but the whole system is biased to think they are. NASA has gotten claims from news organizations who copied NASA's footage of rocket launches. Those NASA videos were not pirated (and neither where the news organization videos, but that's not the point). Piano teachers who play public domain classic works have gotten claims from publishers like Sony. The system is heavily biased towards he big copyright holders and against other publishers, largely regardless of the actual merits of the case. As a sibling comment says, it's at best a win-win-loose situation. As for the DMCA: that system, and how YouTube handles it, has severe shortcomings of its own. It's very well possible that ContentID is better than the DMCA, but that's a very small hurdle to clear.