Second, even if the law were as you said it was, a class action would only be appropriate among people who have actually been in wrecks after the most recent change in terms and conditions --- people who have not crashed have suffered no harm from the alleged policy.
The short version is that Wikipedia is notoriously bad about law because it is largely written by non-lawyers; often it describes the law as Wiki editors _want_ it to be, rather than how it _is_.
 Usefully condensed here: http://volokh.com/2009/11/03/duty-to-rescuereport-statutes/
Nevertheless, it seems unethical for OnStar to profit off human suffering when they are in a position to assist -- I suspect their crash statistics are among the most profitable data they collect.
True, but lawyers do that too at times.
They seems to have no issue broadly interpreting laws.