[blakeperdue]

Is it legal to manipulate web traffic like this? I would assume some companies who depend on ads (eg, NYTimes.com) would object, perhaps with a lawsuit, to ISPs or other imitation ISPs (ie, Hotels) to removing original NYTimes ads and replacing it with their own.

[elliottcarlson]

The same can then be said for using an ad-blocker - are you denying NYTimes.com revenue by blocking their ads?