The use of the web has continued to expand at a much greater rate than the use of ad blockers, even if it were true that everyone in tech installs one (they don't). And now mobile web grows at a great clip each year as well. I imagine use of ad blockers is much lower on smart phones; in particular given the large share of market non-jailbroken iPhones have. I gather it's possible for Android, but I haven't seen enough folks talking about it for me to believe it's that common.