The internet is full of all sorts as it is jon, same as real life, banning paedos 200yds from schools only forces them elsewhere.
Having faceless companies (nevermind governments) track your every move isnt something I really fancy to be honest. Hollie, my 4 year old is already using my home pc and I have locked down youtube and any other sites I catch her on in future as she knows she is only allowed onto the likes of the cbeebies and lazytown sites. I believe if you want to keep your kids safe, protect them, not expect others to do it for you.