I can see some defenses, for example, "We uploaded the content to verify the validity of assertions that filtering and content protection mechanisms were workin

I can see some defenses, for example, "We uploaded the content to verify the validity of assertions that filtering and content protection mechanisms were working as stated." Or, "We were uploading content to quantify viewers and calculate losses due to copyright infringement." Regardless, tons of users were uploading viacom content and youtube and then google profited off it, so their case is just as valid -- if it is valid at all.