1189
Adblockers stop publishers serving ads to (or even seeing) 1bn web users - Press Gazette
(pressgazette.co.uk)
This is a most excellent place for technology news and articles.
Besides the trackers and malware, ads can be categorised as a flaw in technology. A kind of software parasite that uses a computer's resources without providing any additional functionality to the user.
Ads are malware (software maliciously made to do something the user doesn't want), yes. :3