From my account manager from one of the ad networks:
We have had some partners let us know that users have been redirected on their sites, but so far, no one has mentioned iPhone. We’ve added additional URLs to our block list for these redirects and questionable ads and you’re correct in that this time of year is bringing in more complaints. If this is still going on, please send a screenshot when you are able to so that my team can track down if it’s coming from us, and if they need to put additional blocks in place.