Copyrights use to only be for 50 years, until the copyright on "Mickey Mouse" was about to expire and then Disney lobbyed to have copyrights expanded to 70 years, which congress did. The point of this is that copyrights are an artificial creation of the law. No one has an inherent right to profit from their own work.
Internationally, copyrights are very difficult enforce (see “The International Threat to Intellectual Property Rights through Emerging Markets”
Wisconsin International Law Journal, Vol. 22, pp. 213-243 (Winter 2004)) and even in the United States, a copyright is not enforced unless action is taken by the author to enforce the copyright. I'm not an IP lawyer but, Google may have several legal argument to avoid liability. Ones that I can think of are latches, waiver, and alteration of use/media. Besides, in a class action, there must be a "class certification" and that can easily be botched. Another option is that Google might get legislative reform like Disney did.