It seems to be more of an issue with advertisors who slip in stuff with redirects than ad platforms. For example, these sites bid on being able to show an ad, are approved, and then change their coding to redirect off-site. It happens on almost all ad platforms these days. It makes it hard to catch since it happens after the fact.
Thankfully our partner recognizes how frustrating that is for all you guys and they as well. The change I mentioned in my previous post will hopefully help weed those malicious ads out - and hopefully keep them out for the foreseeable future.
We truly hate having those present and wish there was a way to block them 100% so we definitely apologize for that.