Re: Bugger AdBlock, it's Internet advertising that's theft.
That point is relevant, and I imagine you'll find many who won't accept it, but the analogy still applies. In the case of a collect call from a telemarketing system, they are undoubtedly paying for the line capacity, the phone, the person talking, and for any call where the other party doesn't accept the charges. That fact doesn't make the theoretical practice any less odious. In occasions where the data usage is very extreme, I think there's reasonable grounds for complaint. Not that it would do anything, but nonetheless reasonable.