Youtube creators get access to watchtime stats which show a dip for sponsored segments. My understanding is that sponsor contracts typically don't ask to get access to that data though, instead they look at views and refferals
And yet, HN (a text-based website) has advertising. It is a small headline in the list. Do people block this? I don't, and I am quite an adblocking person.
I actually believe billboards are a net minus for public safety. Just like you wouldn't want all kind of unnecessary traffic signs.