Because the diversity visa program is highly competitive, scammers use that as an opportunity to defraud people. You should keep your guard up when applying for the DV Program and note that;
Entering the DV program is free and selection is random – it is impossible to know who will be selected. Hence, anyone asking you to pay a fee to guarantee your selection is only trying to defraud you
The Department of State does not notify winners either by post-mail or email; the only way to know if you’ve been selected is to check your application using Entrant Status Check. Beware of fraudulent mails sent to you informing that you have been selected.