Maybe it is more successful elsewhere, but over here the type of ads and repetition make me think more money is spent on ad infrastructure than is gained in revenue (eg. three ads in a show, all identical, all advertising the platform you are watching). I'm left with the impression that the actual reason is not to sell ads, but to annoy customers into paying for higher tiers. It is not that we have gotten used to ads, but our dislike is being weaponized.
Sometimes when I see my parents or other non-tech people using their phones I'm just aghast at what they put up with. We truly never left the Bonzi Buddy era of the 90s. Simple candy crush clones with banner ads on the top and bottom + interstitial ads every few minutes. Maybe throw in some gambling... ...or visit any given US newspaper or local TV station site without an ad blocker. Fans will spin, scrolling will stutter, and what little content there is will barely be visible through the videos about how chugging olive oil like jesus will give you abs like judas.
The combination of technical prowess and relative wealth of the average HN commenter means I bet we see 1/100th the ads of the average consumer. It's wild out there.