Some would say that the following are also defections in the same terms though:

* Pop-up/-over advertising that gets in the way * Pop-under advertising * Auto-playing video that drains noticeable bandwidth and CPU power (and therefore battery) when mobile * Auto-playing audio, usually at some horrendous volume * Tracking us and storing derived data about our lives in quite some detail without our permission * Collecting free information, wrapping adverts around it, and working hard to make sure the ad wrapped version comes up top in search results above the non-encumbered version (please don't try defend this in the general case with the word "curating")

Free services paid for by the above are only free is you consider the above and related matters to not be costs (which presumably you don't, which is fair enough).

I don't actually run adblock/noscript/what-ever, for performance reasons and because of the inconvenience of false positives and such: I just avoid sites that irritate me with the non-tracking-related stuff (to the point of having some blacklisted in my local DNS settings) and accept that no matter what I do I'm going to be followed by Google, Facebook, and their less reputable compatriots.