Is it?
I used vanilla Chrome with “Ublock lite” in someone else’s computer for a bit, and was shocked by how many ads got through, not to speak of annoyances and what I suspect was a malware link. We also got a related ad on TV soon after browsing for something.
I think Google’s having their cake and eating it. It blocks enough for users to feel like they’re getting Adblock, yet it’s not much skin off Google's back.