You're conflating things, imagine that billboard was not on the wall and instead it jumped in front of you on the way home.

Imagine the advertisement was not on TV but it was ringing your doorbell.

An option is ethical, one when you replace someone else's work is not. (i don't like advertisement thrown in my face either).

As much as I hate the clever marketing tactics that happen, I wouldn't want them to have one more excuse to invade me more.

This seems like one of them