Remove.org

DraftKings.com does not have a clear removal policy that we could find. We did however find the below information on their TOS page

Direct Link: https://www.draftkings.com/help/terms

You may establish only one account per person to participate in the Services offered on the Website. In the event DraftKings discovers that you have opened more than one account per person, in addition to any other rights that DraftKings may have, DraftKings reserves the right to suspend or terminate any or all of your accounts and terminate, withhold or revoke the awarding of any prizes. You are responsible for maintaining the confidentiality of your login names and passwords and you accept responsibility for all activities, charges, and damages that occur under your account. It shall be a violation of these Terms of Use to allow any other person to use your account to participate in any contest. If you have reason to believe that someone is using your account without your permission, you should contact us immediately. We will not be responsible for any loss or damage resulting from your failure to notify us of unauthorized use. If we request registration information from you, you must provide us with accurate and complete information and must update the information when it changes.

They have an ‘Account Management’ area but it has no clear account removal or termination policy. We suggest you email them directly for assistance