Of course it’s user error. However a system makes it easier or harder to achieve a task or make errors. You say it’s clearly not the app that was asked for. I see two equally sized icons of nearly identical color, two equally sized Install buttons if the same color. The first one being the wrong one. And this is after looking for an exact app name. I think we don’t need a focus group to show this drives clicks away from the searched app and to the ad. In fact we can be reasonably sure Google’s research drove the decision to create this UX. In a slightly saner timeline I’d have expected the ad to not have an Install button on it or at the very least to not use the prominent button color. 😒 BTW I didn’t downvote.