> Kant's categorical imperative:
> > Act only according to that maxim whereby you can, at the same time, will that it should become a universal law.
For what it's worth (and perhaps you intended it this way), this is a somewhat shallow application of the categorical imperative. There are other ways to justify using AdBlock (and in fact, condemn not using AdBlock) by means of the categorical imperative. For example: "If everyone uses AdBlock to prevent sleazy ads that can contain malware, then those ads will no longer have value, and they will cease to exist." If you think of AdBlock as a vaccine, then by the categorical imperative, it's necessary to vaccinate everyone[0].
Or, "If everyone uses AdBlock, then websites will have to invent monetization tactics that don't involve auctioning off its user's eyeballs and privacy". If you consider ads to be an intrusion and invasion of privacy, then killing the ad-supported model could actually be a good thing.
I don't really want to get into a debate on adblockers in general, because the topic has been beaten to death on HN before, but I just felt compelled[1] to make this note about the categorical imperative for the sake of others reading this.
[0] This is also a somewhat simplistic reduction, but you get the idea.
[1] (Yes, that's a Kant pun)