Is the use of ad blockers ethical?
Yes, I think so. The most compelling argument against it being ethical that I have read is that when I visit a site there is an implicit contract between the publisher and I: they provide content and in return I agree to be exposed to the ads they place on the page.
I disagree with this argument. I don't believe I ever agreed to this contract. I think it goes back to how the Internet itself evolved and whether by using ad blocking software I am "staying true" to the ethics that developed around this. Here I think the "contract" looks more like this:
As a "publisher", I am free to put out onto the network any content I see fit (excluding of course illegal content such as child porn or whatnot). I am also free to require that to access that content you pay me. As a "consumer" of content, I am free to access whatever content I want, and "curate" it as I see fit. That is, collect headlines, search for key words and only return paragraphs that have the word "Bieber", etc. If it's text, I can use whatever font I want, I can use software that translates words into links to an online dictionary, etc., etc. In my mind this would clearly include pulling out just the content I care about, and ignoring the ads.
One clarification: by "pay me", I mean here in the normal, traditional sense. That is, to access this piece of content, you pay me money, which could be a subscription fee, a one-time fee, etc. I do not accept that a form of payment includes a certain amount of my attention. That may be the deal you want to make, and think is fair, but I do not. And yes, you could argue that thus that simply means I should then simply not collect the content, by the argument given above I disagree.
Also, I do think in certain cases, maybe most, that it is unethical to go about, collecting content, repackaging and reselling that content without consent from original publishers. I am guessing that is out of scope for this discussion.
Another argument that I believe holds weight here is to consider the implications of making this kind of thing illegal. It leads to a kind of destruction of value or promise that the Internet gives. Basically allowing publishers and service providers a kind of control or ownership of the devices and software we use to consume content. Zittrain did a great job of laying out this Draconian future in his book:
The Future of the Internet and How to Stop It.
Scott