They call it “dark traffic” - ads that are not seen by tech-savvy users who have excellent ad blockers.
Not surprised that its growing. The web is unusable without an ad blocker and its only getting worse, and will continue to get worse every month.
I run uBlock Origin for the browsers, and Pi-Hole for the network. Plus a wireguard VPN server that my phone connects to when I’m not on the home wifi for ad-blocking on the go.
I switched to adguard home recently, much nicer user interface and I dont miss any features from pihole. :)