Oh, they care. It's a huge problem. Spend a ton of effort putting up a let's play video or a review of, say, a video game only to have it taken down or the reve

Oh, they care. It's a huge problem. Spend a ton of effort putting up a let's play video or a review of, say, a video game only to have it taken down or the revenue snatched away. Or, have someone abuse the system against you, which happens, and be forced to struggle through the kafkaesque bureacratic nightmare to get things fixed. Dealing with the broken aspects of content-id and the particular way youtube has implemented DMCA compliance adds a significant amount of hassle and overhead to a great number of folks who make content on the site.