Same sad issue here, sudden total drop in site quality. Had to install an ad-blocker on Chrome just to get in here and register a complaint.
Happy to turn the blocker off once the error is confirmed fixed, as ads are a way of internet life, but this is really too much. The longer it goes, the more I'm convinced that they are working on a solution to ensure all this back-end ad delivery is corrected and not an immediate stand-down of the service in question to keep the site running and usable.