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.
My daughter has become obsessed with watching videos about the game Wobbly Life. There’s one YouTuber who seems to post extremely frequently and advertises in every video for a subscription mod platform. She is now always asking about that mod platform, and the best way we can explain it to her (because she’s 5 and simply too young to understand what mods even are, has zero room for any nuance on her world views etc.) is we just give her a hard-line “we do not pay for mods”