Netflix
Netflix promised its customers "unlimited DVD rentals" for a monthly flat fee, with "one day delivery." But in fact, the more quickly a customer watched and returned his movies, the more slowly Netflix sent the next one. The suit alleged that Netflix's goal was to limit monthly usage and keep its costs down.
In a court-approved settlement, Netflix agreed to change its advertising and give class members free movie rentals worth over $75 million. All former members got a free month of membership, and all current members got one a free upgraded month of membership to current members.