Did you read the terms you agree to when you enter? Here is part of them:
WHEN YOU PARTICIPATE IN THIS SWEEPSTAKES AND PROVIDE US WITH YOUR EMAIL ADDRESS OR OTHER PERSONAL INFORMATION, WE AUTOMATICALLY PLACE YOU ON OUR MAILING LIST
Yes, even when they offer a box asking to be excluded from mailing lists of theirs or passing it own, I always assume they will, so I use hotmail, etc.
