Do you really think anyone who cares enough to want to use a service like this simultaneously doesn't care enough to want to be there in person if they could? If the options are nothing/regular tv or this, which is better?
If the site owners have kids, they will understand all the vast differences in parental philosophy and choices. And they can predict some of the positive and negative reactions to their product.
I personally have a negative reaction. I also clearly stated that I thought others would have a positive reaction.
The point isn't the specific reaction of any given parent. It is the full spectrum of reactions that the general population will have. If they have children, this is a topic they probably already know. If they don't have children, they could be in for surprises.
So it is a valid question -- "Do you know your market?"
