We consider auto entry to be when an entrant uses a program or service to automatically enter a contest or sweepstakes without ever having gone to the site or page in order to do so. There are programs which the entrant can have on their own computer that does this as well as paid services which enter on behalf on the person. There are several programs that assist people in entering contests and completing forms. By assisting they keep track of what they have entered or use simple macro functions to complete a form instead of manually typing into the form fields. While these types of programs are assisting the entrants, they all still require an entrant to personally go to a site to enter each time.
Companies hold contests and sweepstakes as a form of advertisement.
On the internet they want you to visit their site and see what they have to offer by way of products, services and advertisers. When you use the auto entries you don't go to their site and see any of that. The more money a company makes the more likely they are to hold future contests and sweepstakes. With the smaller companies, the more orders they get from people who are entering the more likely they are to hold more contests and sweepstakes. Of course don't use the automated programs or services, but you can also help by letting other sweepers know about why it's not a good idea.