I know that all 3 major search engines doesn’t like gambling, pharmaceutical and adult related content but did you know that Microsoft Adcenter mentions explicitly that they are against free offers and sweepstakes too?
Excerpt from editorial best practises for search advertising
Inappropriate Language and Content
To create an effective campaign, avoid the following elements:
Software downloads, not expressly consented to by the user
Free offers and sweepstakes
Illegal contests, pyramid schemes, and chain letters
Personals and dating content
Webcams and surveillance equipment
Defamatory, libelous, slanderous content
Content that violates rights of privacy or publicity
Hate speech, profanity
Online pharmacies, pharmaceutical products, and medical products
Suffering and violence
Alcohol, tobacco, firearms, fireworks
Spam and bulk marketing products
Bypassing of copyright protection
Cable descrambling devices
Non-accredited universities, fake educational transcripts
Traffic devices and tickets
I came across this while doing some research on doing free offers campaigns with PPC, just thought that this might be useful for someone.
Have you tried running free offers campaigns on Adcenter before?