Just got an email about a survey on my "experience" with Facebook ads. Everybody here should take it and give their input. In the last comments box I put :
Allow diet and rebill ads, these sorts of offers all all BUYER BEWARE. It only hurts their experience on Facebook if they choose to click the ad.
People see around a 0.10% CTR on these ads, maybe a little higher. So out of the 0.10% that click, probably 2% of that number actually sign up for the product AND complain about it AND want a chargeback on their credit card.
We're talking about such a small percentage of unhappy Facebook users in return for a massive boost in FB ad revenue. The pros outweigh the cons and if you want Facebook ads to be 10x as successful and profitable, you'll allow ads like these to run.