Earlier quoted context omitted.
Why does it matter whether it's automatic?
Because if you have to manually notice, recognize, then look away, then arguably you've already paid with your attention. If someone or something is doing it for you (and others) automatically then it eliminates the 'payment' and undermines producers ability to produce.
Doesn't it also undermine producers ability to produce if you just get really good at quickly looking away?
It seems from your argument the "case could be made" that it's at least a little unethical to not spend at least a little while paying attention to each ad when reading a newspaper.
Like there's some scale where the left side has "0 attention spent, 0 ethical" and the right side has "maximum attention spent, maximally ethical".