I cannot believe it myself until I received an email about whose the Winner of a contest that I took part. The contest was open to all and Someone "spammed" their contest with over 5,000 fraudulent entries, and it took them time to remove them. They ensure that the contest was fair for everyone.
It is my first time knowing that someone will spammed just to win a contest. The spam as much as 5000 fraudulent entries. That is not a small number!