In the Adsense cases, the argument can be made (not sure I fully agree, but I don't use Adsense so I can't really speak specifically about it, but customers can

In the Adsense cases, the argument can be made (not sure I fully agree, but I don't use Adsense so I can't really speak specifically about it, but customers can be held accountable for interfering with business operations). In the Adwords cases (patio1, e.g.), Google is the vendor.