Low cost- low value: Freedating is a perfect proof of this. It's not really free, it's just cheaper than others, but it's really horrible. Most messages are computer generated. It's hard to find anyone real. On top of this, they have more men than women, so that really complicated the search for all men.
By the way, Freedating admins monitor and modify all messages but not because they want to figure out and ban scammers. They don't even try to prevent scam. All they care about is not to let you switch to free media. Anyway, I left Freedating because I have better things to do with my time.
Answer: No, you can't stop them. Moreover, there have been lots of cases of harassment and stealing people's photo and data from Freedating. It's safer to use sites like http://J4Dates.com They have reasonable fees and your data, including your financial information is protected. I stopped using Freedating after 3 unauthorized charges that were put on my bank card one week after I signed up for Freedating.
FreeDating has a rating of 1.5 stars from 23 reviews, indicating that most customers are generally dissatisfied with their purchases. FreeDating ranks 595th among Dating sites.