Users use sites for their own purposes and, as much as possible, care not a whit what the TOS might have to say about these subjects. Only with extreme rarity is a TOS actually promoted as important, or in any way showcased. They are typically only trotted out as an ineffective weapon for the argument of the moment. The pendulum will forever adjust to the topics of the time.
Frankly, I think that the sites that have the most to lose from having parts of their site suppressed, generally have the least to offer anyway. People recognize content that exists only for ads. (Not knocking ads. Ads have been very very good to me:))
...and I agree that Norton is just awful, but their product is now facing some brutal competition. There are a lot more sources for their most mainstream products. I wish them ill.
"I think it's strange that Google is promoting firefox now. It's only a matter of time before Mozilla users switch onto the idea of blocking all Adsense (via extensions).
Any thoughts on this?"
Yeah, I'm doing it. I already have all the adSense ads blocked and, reading through this, got the idea to block the urchin.js script - ran over to segway.com, fired up adblock and voila! I'm invisible!