They probably figured out a way to use a script to trick whatever method Apple is using to block it. Maybe a quick series of multiple redirects? I've noticed it less, but yeah it does occasionally happen. I just stopped visiting sites that spam like that. Not worth the trouble. Some of them are really bad every time you click on a story it will take you out to some ridiculous IAP freemium crime against humanity candy crush ripoff. I hardly play any games on my iPhone any more because it's so hard to cut through all the crap and find some good games. But that's a rant for another thread.