Not to disparage Stijn's efforts, but he's about a quarter century late to the AR ad-blocking game: when Steve Mann came give a talk at the University of Waterloo whilst I was an undergrad there (circa 1997–2000), one of the applications of his wearable computer that he demonstrated was the ability to recognise and block ads on posters and billboards.

Of course at the time the computing power needed just to do the image tracking was far in excess of what could be carried on his person, so it involved a (possibly pre-WiFi) radio link to a lab network of graphics workstations, and as far as I know the software wasn't doing any kind of AI ad identification, but only matching pre-tagged ad images (or maybe just tracking the physical locations of the user vs the known location of the ads, via GPS + INS + video tracking).

It was nevertheless an exceedingly impressive demo that it has taken quite some time to make a significant improvement on.