A sleezy operation, but not unique in that regard. There are many businesses that engage in this kind of automatic billing not specifically authorized by the customer. They know exactly what they are doing. They are hoping that users, who probably need them for one search, will sign up for a trial, unaware that they will be billed in perpetuity until the service is cancelled. Thus, by default, they will gain monthly charges from your credit card.
No one should ever deal with this sleazy company. I am going to have them investigated by the Nebraska Attorney General. I hope he puts them out of business.