They probably aren't even aware of what type of videos and/or surveys are available.

There's beer surveys as well as videos, rated R movie previews, political videos just to name a few.  Rarely, some of the videos will ask for proof of age to make sure you are old enough to view a "racier" video but we all know how that goes when someone under age decides to not tell the truth about their age.

I once compiled a list of various surveys that sent a person to a page that had virus attacks and their reply to me was:  Good job!  Keep up the good work!

And I'm thinking, then why don't you remove those surveys?  they are still there.

At the very least they could have a button where you can report that it is not appropriate for this particular site.
(Haven't seen the Axe video but I think the political one is too funny since a lot of players aren't from America or even old enough to vote.)