It's not like it's a guarantee. And being the "kind" of attitude doesn't mean you miss the exact same things in each situation. It didn't bite you here but it's a risk elsewhere.
> Maybe you missed it because you were focused on the wall of text instead of the UI.
I was looking at the ads the whole time, but I was intuitively focusing edges and the corners and the fine print at the bottom but the actual marker was tucked into the middle very small.
That's the exact kind of attitude that will make people miss an "obvious" marker.
And I wouldn't call that tiny thing on the third row of text obvious. Even knowing it said 'ad' somewhere, it took me several tries to find it.