For whatever it's worth, I think there's a difference between mentioning libertarianism in a negative light and holding it responsible for society's ills. I think libertarianism is worth debating, and the political Libertarianism practiced in America is often ridiculous and utterly biased against individuals. But I don't think that being refused access to a service if you reject risky and unethical advertising practices is a consequence of misinterpreted libertarian theory.
The highest-profile appeals to corporate interests are made by politicians who don't claim libertarian ideal. The ability to cut consumers off from non-essential, non-monopoly services for terms violations is standard throughout countries without any libertarian tradition, so the exotic element in the US is the legal protection for spyware creators and malware distributors, neither of which stem from libertarian theory. The spyware aspect is about the lack of a direct constitutional privacy protection, and the conservative/literalist readings which have steadily eroded the penumbra reasoning. The malware aspect is the result of repeated failures to hold companies responsible for allowing data breaches or serving exploits, which owes more to special interests pandering and gross technical ignorance among legislators than to even a pretense of libertarianism.
You're right to say that cutting off service access is legal, and you're right to say that the most influential form of libertarianism in the US is twisted and often counterproductive. But I suspect I'm not alone in finding the attribution of any business-related badness to libertarianism tiring and a bad basis for a productive conversation.