Most people consider that an extreme take, but I agree completely. They're an active drain on the environments they're placed in - both physical and digital. They're a drain on the mental energy of the people who are forced to see or hear them. They make the entire world feel artificial and fake - a place not made for humans.
Personally I ignore most ads but I have also bought some really good products based on ads and there are companies I wish would advertise more, for example relvant conferences that I only find out about because someone posted about their experiences being there.